Logical ReasoningDifficulty: Easy

PT125 S2 Q21 Explanation

Most people who become migraine

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

TopicsParallel Flaw

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Stimulus

Most people who become migraine sufferers as adults were prone to bouts of depression as children. Hence it stands to reason that a child who is prone to to suffer migraines during adulthood.

What this question is testing

Parallel Flaw

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
21.

The flawed pattern of reasoning in the argument above is most parallel to that in which one

Answer choices

  1. Correct86% picked this

    Most good-tempered dogs were vaccinated against rabies as puppies. Therefore, a puppy that is vaccinated against rabies is likely to

    Why this is right

    Most GTD’s were vaccinated as puppies. Thus, if you’re vaccinated as puppy, you’ll likely be a GTD.

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

  2. Valid / Bad Conclusion Match7% picked this

    Most vicious dogs were ill-treated when young. Hence it can be concluded that a pet owner whose dog is vicious is likely to have

    This does not reverse the Most statement. It actually correctly reasons that if someone is A, they’re likely B. Most vicious were ill-treated when young. Thus, if vicious then probably ill-treated when young.

  3. Bad Conclusion Match2% picked this

    Most well-behaved dogs have undergone obedience training. Thus, if a dog has not undergone obedience training, it will

    The conclusion of the original said, “Thus if you’re B, you’re likely to be A”. The conclusion of this is saying, “Thus, if you’re not-B, then you’re not-A”. Most well behaved had training. Thus, if you didn’t have training, you won’t be well behaved.

  4. Bad Conclusion Match1% picked this

    Most of the pets taken to veterinarians are dogs. Therefore, it stands to reason that dogs are more prone to illness or

    Out Of Scope: "prone to illness or accident"The conclusion of the original said, “thus if you’re B, you’re likely to be A”. This conclusion is saying, “if you’re B, then you’re C”. Instead of looping back to the idea of “taken to veterinarians”, it introduces a third (albeit related) concept of “prone to illness or accident”.

  5. Valid / Bad Conclusion Match3% picked this

    Most puppies are taken from their mothers at the age of eight weeks. Thus, a puppy that is older than eight weeks is likely

    The conclusion does not reverse the original claim. Instead of saying, “Thus, if you were taken from your mother at eight weeks, you’re probably a puppy”, it begins by saying “Thus, if you’re a puppy older than eight weeks”. This argument is actually valid. If we say “Most American children know their alphabet by age 5”, then we’d be allowed to infer “If you’re an American child older than 5, then you probably already know your alphabet”.

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