Logical ReasoningDifficulty: Hard

PT152 S2 Q12 ExplanationIf an activity significantly

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

TopicsNecessary Assumption

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Stimulus

If an activity significantly reduces chronic lower back pain, doctors should be prepared to discuss the merits of that activity with patients who ask about it. A recent study compared practicing yoga to taking stretching classes with a physical therapist and found that both activities lead to equal reductions in chronic lower back pain should be prepared to discuss the merits of yoga.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

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 is an assumption required by

Answer choices, explained

  1. Too Strong4% picked this

    There are no activities that lead to more significant reductions in chronic lower back pain than do stretching

    Too Strong: no activities that lead to more The author doesn't need to believe that stretching with a physical therapist is the absolute #1 way to reduce chronic lower back pain. She only needs to assume that stretching with a physical therapist achieves a significant reduction.

  2. Correct61% picked this

    Taking stretching classes with a physical therapist significantly reduces chronic lower

    Why this is right

    This is what we thought we were looking for. If we negated this, it would be a big objection to the argument. If stretching with a physical therapist doesn't significantly reduce, then yoga also doesn't significantly reduce. Thus, yoga would trigger that rule that says that doctors should be prepared to talk about it.

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

  3. Too Strong: few4% picked this

    Few treatment options for those with chronic lower back pain

    Just because we're only mentioning two treatment options (yoga and stretching with a physical therapist) doesn't mean those are the only two options. There might be many, many more options. That wouldn't affect the author's argument in any way. Doctors should be prepared to talk about any of those many options that achieve a significant reduction in pain.

  4. Too Strong: no past studies3% picked this

    No previous studies have compared practicing yoga to taking stretching classes with

    Who cares whether this is the first study to compare yoga to stretching with a physical therapist or if it's the 379th study to do so? Neither would affect the logic of the author's argument.

  5. Out of Scope29% picked this

    Many doctors treating patients with chronic lower back pain discuss with their patients the merits of taking stretching

    Out of Scope: should vs. actually do We want to know whether stretching with a physical therapist causes significant reductions in pain. If it does, then by the conditional rule in the first sentence, the author would be assuming that doctors should be prepared to talk to their patients about taking stretching classes with a physical therapist. But the author doesn't have to assume anything about whether doctors actually do talk to their patients about stretching classes.

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