Logical ReasoningDifficulty: Medium

PT129 S2 Q8 Explanation

A psychiatrist argued

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

TopicsParallel Flaw

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Stimulus

A psychiatrist argued that there is no such thing as a multiple personality disorder on the grounds that in all her years of clinical practice, case of this type.

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
8.

Which one of the following most closely parallels the questionable reasoning

Answer choices

  1. Weak Conclusion Match20% picked this

    Anton concluded that colds are seldom fatal on the grounds that in all his years of clinical practice, he never had a

    We were looking for "it don't exist", not "it seldom occurs". The evidence is similar, but the conclusion allows for the idea that "even though I've never seen it, it may sometimes still occur". Be wary of answers that seem to quote verbatim phrasing from the argument (unless they all do). The whole "In all his years of clinical practice" is too on-the-nose for LSAT to offer as a correct answer.

  2. Bad Conclusion Match / Reasonable1% picked this

    Lyla said that no one in the area has seen a groundhog and so there are probably no

    The original conclusion is "there is no such thing as X". This one is "there are probably no X's in the area". That's not strong enough to replicate the same flaw. It's a pretty reasonable conclusion to draw from the fact that no one in the area has seen a groundhog.

  3. Bad Conclusion Match1% picked this

    Sauda argued that because therapy rarely had an effect on her patient's type of disorder,

    The original conclusion was "there is no such thing as X". This conclusion is "there's no good reason to do X". That's a hopeless mismatch. Also, be wary of answers on Parallel that mimic the topic of the original closely: the correct answer would be very unlikely to ALSO be talking about therapy or mental disorders.

  4. Bad Conclusion Match / Bad Premise Match0% picked this

    Thomas argued that because Natasha has driven her car to work every day since she bought it, she would probably continue to

    The original conclusion was "there is no such thing as X". This concludes, "Person A will probably keep doing X". That's not even close. The evidence also is not a good match for the original's, "If I've never seen it ....

  5. Correct78% picked this

    Jerod had never spotted a deer in his area and concluded from this that there are no

    Why this is right

    Correct: If I ain't seen it, it don't exist This one is slightly different from the original because this conclusion is at least moderately restricted to "there aren't any X's in this area", whereas the original argument was "there aren't any X's anywhere". But this is still the closest match we've got.

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

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