Pineal stalk is a fine tubular outgrowth from

Roof of fourth ventricle

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Roof of third ventricle

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Roof of lateral ventricle

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Floor of third ventricle

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Solution

The correct option is B Roof of third ventricle
The pineal stalk extends from the epithalamus of the diencephalon. The epithalamus forms the roof of the third ventricle which is also called the diocoel. Thus, the pineal stalk is a fine tubular outgrowth which extends from the roof of the third ventricle.
Hence, the correct answer is 'Roof of third ventricle'

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