Question

fill in the blank question
the third ventricle of the brain is indicated by the letter
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Explanation:

To determine which letter indicates the third ventricle, we recall brain anatomy: the third ventricle is a narrow cavity between the thalamus (in the diencephalon). In the diagram, letter B corresponds to the region of the third ventricle (between the cerebral hemispheres, near the diencephalon).

Answer:

B