The pineal gland of the human brain secretes melatonin concerned with

Anger

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Colouration of skin

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Parturition

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Lactation

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Solution

The correct option is B
Colouration of skin

Melatonin is an amine hormone derived from tryptophan.

The gland is light sensitive, and the secretion of melatonin is influenced by light.

Melatonin stimulates the melanocytes of the skin to produce more melanin, a skin pigment.

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