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B
Pallium
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C
Hypothalamus
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D
Epithalamus
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Solution
The correct option is B Hypothalamus The diocoel is the 3rd ventricle that is located in the diencephalon which is made up of the thalamus, epithalamus and hypothalamus. The thalamus is laterally present along the 3rd ventricle. The hypothalamus is present anteroinferior, that is it forms the floor of the 3rd ventricle. Apart from the hypothalamus, the mammillary body, infundibulum and the tectum of the midbrain also forms the floor of the third ventricle.