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Q.

The hormone released by the pineal gland of the human brain is concerned with 

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a

anger

b

libido

c

calcium balance

d

sleep

answer is D.

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Detailed Solution

Pineal secretes a hormone called melatonin. Melatonin plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body. 

It helps in  maintaining the normal rhythms of sleep-wake cycle, body temperature. 

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