Logical ReasoningDifficulty: Medium

PT13 S2 Q23 Explanation

When people experience throbbing in

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

TopicsParallel Flaw

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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

When people experience throbbing in their teeth or gums, they have serious dental problems, and if a dental problem is serious, it will be a problem either of tooth decay or of gum disease. Therefore, since throbbing in the teeth or gums is a sign of serious dental problems, and can be suffering from neither tooth decay nor gum 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
23.

Which one of the following contains an error of reasoning most similar to that made in

Answer choices

  1. Trap4% picked this

    People who drink a lot of coffee are said to have jittery nerves. Therefore, medical students who drink a lot of coffee should not

  2. Trap3% picked this

    A legally practicing psychiatrist must have both a medical degree and psychiatric training. Thus, since Emmett has not undergone psychiatric training, if he is

  3. Trap11% picked this

    Someone with severe nasal congestion has a sinus infection or else is suffering from an allergy. Therefore, if Barton does not have a sinus

  4. Correct75% picked this

    If a person is interested in either physics or chemistry, then that person would be wise to consider a career in medicine. Yolanda, however,

    Why this is right

    Answer D is correct.

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

  5. Trap8% picked this

    Someone who is neither an ophthalmologist nor an optometrist lacks specialized training for diagnosing defects of the eye. Therefore, Kim must have been trained

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