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B
Thyroid gland.
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C
Adrenal gland.
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D
Pineal gland.
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Solution
The correct option is D Pineal gland. The correct option is (d) Pineal gland.
The smallest organ is the pineal gland. It is situated centrally in the brain. It is the main site for the secretion of melatonin that controls the internal clock of the body.