Logical ReasoningDifficulty: Easy

PT129 S3 Q15 Explanation

Medical ethicist: Assuming

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

TopicsParallel Flaw

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Medical ethicist: Assuming there is a reasonable chance for a cure, it is acceptable to offer experimental treatments for a disease to patients who suffer from extreme symptoms of that disease. Such patients are best able to weigh a treatment's risks against the benefits of a cure. Therefore, it who experience no extreme symptoms of the relevant disease.

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
15.

The flawed reasoning in which one of the following is most similar to the flawed reasoning in the

Answer choices

  1. Bad Conclusion Match5% picked this

    Even a geological engineer with a background in economics can lose money investing in mineral extraction. So, those who are less knowledgeable about geology

    The original conclusion was "it is never acceptable". This conclusion is "we shouldn't always expect it". The mismatch between "it never happens" and "you shouldn't expect it every time; there will be some counterexamples" is enough to eliminate. The premise is also a weak match, though, since it is again saying something wishy-washy: this type of person sometimes loses money. The premise from the original was universal: it is always acceptable for this type of person.

  2. Bad Conclusion Match6% picked this

    One is always in a better position to judge whether an automobile would be worth its cost if one has test-driven that automobile. Therefore,

    This starts off promising enough: If you test-drove, then you will be in a better position to judge value. So the matching conclusion would be: Thus, people who don't test-drive are never in a position to judge value.

  3. Correct82% picked this

    Someone born and raised in a country, who has lived abroad and then returned, is exceptionally qualified to judge the merits of living in

    Why this is right

    Yes, this replicates the formula we were looking for. If you're of type X, then thing Y applies. if you were born and raised here, left, then came back, then you're qualified to judge. Thus, if you're not of type X, then thing Y doesn't apply Thus, if you weren't born and raise here, then you're not qualified to judge.

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

  4. Not a Flaw2% picked this

    One can never eliminate all of the risks of daily life, and even trying to avoid every risk in life is costly. Therefore, anyone

    It seems pretty reasonable to argue, 'if you can't change X, and trying to change X could actually screw you up, then a reasonable person would learn to accept X."

  5. Bad Conclusion Match5% picked this

    Almost any industrial development will have unwelcome environmental side effects. Therefore, it is not worthwhile to weigh the costs of potential environmental side effects

    This started out okay: If industrial development, then very likely to have unwelcome environmental byproducts. But it would need to conclude: Thus, if not an industrial development, then very unlikely to have unwelcome environmental byproducts.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free