Logical ReasoningDifficulty: Hard

PT155 S2 Q14 Explanation

In a study, six medical

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

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Stimulus

In a study, six medical students were each separately presented with the same patient, whose symptoms could be the result of any one of several medical conditions. The attending physician asked each student a leading question of the form, “What tests should we order to try to rule out a diagnosis of Each student began by testing the diagnosis that had been suggested by the original attending physician.

What this question is testing

Most Supported

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
14.

Which one of the following statements is most strongly supported by the

Answer choices

  1. Correct67% picked this

    On the second occasion, none of the medical students began by testing the same diagnosis as any of

    Why this is right

    This seems pretty provable. Since they were all given different diseases the first time (one got X, one got Y, one got Z), and since they all began the second time by addressing the disease they were given (one began with X, one began with Y, one began with Z), it seems pretty safe to say that none of them began in the same way.

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

  2. Out of Scope4% picked this

    At most one of the medical students knew which of the several medical conditions was most likely to

    Out of Scope: knew the most likely one This tries to make an inference from the inference. Since they all began by talking about different diagnoses, at most one of them was correct? Two problems: - it's possible that more than one condition afflicts the patient. It might be a combo of diabetes and emphysema. - it's possible that the med students began talking about the disease assigned to them in the first go-round, even though the student knew a different medical condition was more likely to lead to those symptoms. We'd be making a leap from "if you started by talking about disease X, then you thought that X was most likely to lead to the patients' symptoms", but that's not a definite move we can make.

  3. Out of Scope: awareness4% picked this

    The second attending physician was unaware of the results of the students’ encounter with the

    We have no idea whether the second doctor was in on this scheme or oblivious to it. She just asked the students, "What do y'all think is the diagnosis?" That's compatible with her being aware of what the first doctor did or being oblivious to it.

  4. Too Strong: exactly one3% picked this

    On the second occasion, exactly one of the students tested for the medical condition that actually

    This is like (B) in trying to go one step farther ... "Since they all tested for different diseases, only one of them was right." Two problems: - more than one condition might afflict the patient, so more than one student can be right - it might be that all the students were wrong, so maybe zero students were testing for the correct condition(s)

  5. Out of Scope: awareness22% picked this

    At least some of the medical students were unaware that the patients’ symptoms could be the result of medical conditions other than the one

    We can't speak to what the med students were or weren't aware of. We didn't get any information about their thoughts. Their behavior in repeating the disease they were assigned the first time around could mean that they think "one of those conditions the first doctor offered must have been the right answer", but it could also mean "the doctors want me to prove that I can rule out all these wrong answers first".

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