A) thymus
B) skin
C) pituitary
D) pineal gland
Correct Answer: D
Solution :
Melatonin is secreted by pineal gland present between the cerebral hemispheres. Melatonin concentration in blood follows a diurnal cycle, it rises in the evening and drops at noon. Melatonin lightens skin colour in certain animals and regulates working of gonads.
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