Logical ReasoningDifficulty: Medium

PT12 S4 Q6 Explanation

Chronic fatigue syndrome is characterized by

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

TopicsNecessary Assumption

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Stimulus

Chronic fatigue syndrome is characterized by prolonged fatigue, muscular pain, and neurological problems. It is not known whether these symptoms are all caused by a single virus or whether each symptom is the result of a separate viral infection. A newly synthesized drug has been tested on those who suffer from chronic there is evidence that chronic fatigue syndrome is, in fact, caused by one virus.

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
6.

The argument assumes which one of

Answer choices

  1. Trap1% picked this

    All those who suffer from prolonged fatigue also suffer from

  2. Correct75% picked this

    It is more likely that the new drug counteracts one virus than that it

    Why this is right

    Answer B is correct.

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

  3. Trap6% picked this

    The symptoms of chronic fatigue syndrome are dissimilar to those of

  4. Trap13% picked this

    Most syndromes that are characterized by related symptoms are each caused by a

  5. Trap5% picked this

    An antiviral medication that eliminates the most severe symptoms of chronic fatigue syndrome thereby cures

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