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B
Lateral wall of diencephalon
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C
Dorsal side of optic lobes
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D
Floor of diencephalon
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Solution
The correct option is A Roof of diencephalon The epithalamus comprises the thalamus, hypothalamus and also the pituitary gland. It is located at the dorsal aspect of the diencephalon. It also includes the habenula, pineal gland and also the stria medullaris. The thalamus and hypothalamus have been previously described. The pineal gland contains no true neurons, only glial cells. Through a complicated process involving the hormone melatonin, it participates in the regulation of the body’s circadian (24-hour) rhythms. The stria medullaris connects fibers from the habenular nuclei with the limbic system. The specific function of the habenular nuclei in human beings is unclear.
So, the correct answer is 'Roof of the diencephalon'.