2

Set 4: Inferences (Intermediate)

Explanation

Answer: B

PASSAGE

Studies show that exercise promotes neurogenesis—the creation of new brain cells—in the hippocampus, a region associated with memory. Paradoxically, some researchers have questioned whether these new cells actually integrate into functional circuits, as the evidence for cognitive improvement from adult neurogenesis remains mixed.

What can be inferred about exercise and brain health?

A. Exercise definitively improves memory through neurogenesis.
B. While exercise promotes new cell growth, its cognitive benefits are still being verified.✓ Correct
C. Neurogenesis has no connection to the hippocampus.
D. Scientists have stopped studying neurogenesis.

Detailed Explanation

New cells are created but functional integration and cognitive benefit are 'questioned' and 'mixed'—still verifying.

Key Evidence:

• "questioned whether cells integrate"

• "evidence remains mixed"

Why others are wrong: A ('Mixed evidence' means not definitive.), C (Neurogenesis occurs 'in the hippocampus.'), D ('Some researchers' are still questioning = ongoing study.).

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