Logical ReasoningDifficulty: Hard

PT4 S4 Q24 Explanation

The brains of identical twins

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

TopicsMust be False

Keep going in LSAT Lab

  • Save & drill this skill — build targeted practice sets from questions like this one

  • Video walkthroughs — watch every question solved step by step

  • 81 official LSATs — as questions, timed sections & full-length tests

Start practicing free

Free to start

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

The brains of identical twins are genetically identical. When only one of a pair of identical twins is a schizophrenic, certain areas of the affected twin’s brain are smaller than corresponding areas in the brain of the unaffected twin. No such differences are found when neither twin is schizophrenic. caused by damage to the physical structure of the brain.

What this question is testing

Must be False

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
24.

If the statements on which the conclusion above is based are all true, each of the following could

Answer choices

  1. Trap15% picked this

    People who lack a genetic susceptibility for the disease will not

  2. Trap7% picked this

    Medications can control most of the symptoms of schizophrenia in most patients but will never be

  3. Trap9% picked this

    The brains of schizophrenics share many of the characteristics found in those of people

  4. Correct59% picked this

    It will eventually be possible to determine whether or not someone will develop schizophrenia on the basis

    Why this is right

    Answer D is correct.

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

  5. Trap10% picked this

    Brain abnormalities associated with schizophrenia are the result of childhood viral infections that inhibit the

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

Save and practice this skill
LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free