Logical ReasoningDifficulty: Easy

PT145 S2 Q12 Explanation

When doctors vaccinate a patient

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsPrinciple-Conform

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Stimulus

When doctors vaccinate a patient, their intention is to expose him or her to a weakened form of a disease-causing pathogen and thus to make the patient better able to resist the pathogen severe form of that disease later.

What this question is testing

Principle-Conform

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
12.

Which one of the following best illustrates the principle that the

Answer choices

  1. Bad Match0% picked this

    Some directors instruct actors not to rehearse their lines in the several days preceding the opening night of a play, so that the actors

    We're looking for "expose yourself to something mildly bad, so that you're better prepared later to avoid something way worse". This is talking about "avoid doing something mildly good (don't rehearse your lines)".

  2. Correct86% picked this

    Some parents read their children fairy tales containing allegorical treatments of treachery and cruelty, with the intention of making them less emotionally vulnerable to

    Why this is right

    We're looking for "expose yourself to something mildly bad, so that you're better prepared later to avoid something way worse". This is talking about presenting the dark side of humanity to your kids (treachery and cruelty) in a weakened, more manageable form (fairy tales) so that they will be less vulnerable to these dark things later in life. Using a fairy tale is a "safe" way to expose kids to something nasty, in the hopes that when they encounter this nasty stuff later in life, they will deal with it better. Similarly, vaccines are a "safe" way to expose people to something nasty, in the hopes that when they encounter this nasty stuff later in life, they will deal with it better.

    Skill tested: Principle-Conform · how this choice captures the argument's function is the move to repeat next time.

  3. Bad Match5% picked this

    In some circumstances, firefighters use fire to fight fire by creating an intense explosion very close to an uncontrollable blaze that they wish to

    We're looking for "expose yourself to something mildly bad, so that you're better prepared later to avoid something way worse". This firefighter example would match if the passage had said doctors sometimes "fight an existing disease by blasting it with some other disease, so that there's a disease explosion, and the original disease is deprived of its ability to grow".

  4. Bad Match3% picked this

    In some cases, a business will close down some of its operations, its intention being to position the company to be more profitable later

    We're looking for "expose yourself to something mildly bad, so that you're better prepared later to avoid something way worse". This is talking about "expose yourself to something mildly bad so that you can be better prepared to do something awesome later". (Shutter your operations for a bit, which will mean you're not making any revenue and taking a bit of a financial hit so that you can re-open your business once you've better positioned yourself for profitability.)

  5. Bad Match5% picked this

    Some police departments energetically pursue those who commit minor crimes; in doing so they intend to provide examples to deter people who might

    We're looking for "expose yourself to something mildly bad, so that you're better prepared later to avoid something way worse". This is somewhat tempting because it's talking about cracking down on minor crimes (which sounds like a mild bad) in order to deter a more-serious crimes (which sounds like something way worse). But the logic doesn't match as well as (B)'s. In this answer, we're doing something harsh to a Person X that did a mildly bad thing, so that Person Y will be too scared to do a severely bad thing. In the original, we're doing a mildly bad thing to Person X (infecting it with a weak disease), so that Person X will be better protected in the long run.

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