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Q.

A hormone responsible for normal sleep-wake cycle is 

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a

gastrin

b

melatonin

c

insulin

d

epinephrine

answer is C.

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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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