Logical ReasoningDifficulty: Medium

PT4 S1 Q15 Explanation

Baking for winter holidays

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

TopicsMust be True

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Stimulus

Baking for winter holidays is a tradition that may have a sound medical basis. In midwinter, when days are short, many people suffer from a specific type of seasonal depression caused by lack of sunlight. Carbohydrates, both sugars and starches, boost the brain’s levels of serotonin, a neurotransmitter that improves the mood. Thus, eating holiday cookies may provide an effective form of self-prescribed medication.

What this question is testing

Must be True

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
15.

Which one of the following can be properly inferred from

Answer choices

  1. Trap0% picked this

    Seasonal depression is one of the most easily treated forms

  2. Trap16% picked this

    Lack of sunlight lowers the level of serotonin in

  3. Trap2% picked this

    People are more likely to be depressed in midwinter than at other times

  4. Correct77% picked this

    Some antidepressants act by changing the brain’s level

    Why this is right

    Answer D is correct.

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

  5. Trap5% picked this

    Raising the level of neurotransmitters in the brain effectively

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