Which of these is not a placental hormone?

Progesterone

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HCG

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Estrogen

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Melatonin

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Solution

The correct option is D Melatonin
Melatonin is secreted from pineal gland. This hormone regulates circadian rhythm of body like sleep-wake cycle, temperature of body etc. It also maintains pigmentation, metabolism and defence capability.
Progesterone, estrogen and HCG (Human chorionic gonadotropin) are secreted from placenta during pregnancy. In addition to placenta, progesterone is also secreted from corpus luteum and estrogen is also secreted from ovarian follicles.
So, the correct answer is 'Melatonin'.

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