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Which of the following hormones is not a secretion product of human placenta?

1. Human chorionic gonadotropin
2. Prolactin
3. Estrogen
4. Progesterone

Correct answer: Prolactin

Solution

The human placenta secretes hCG, estrogens, and progesterone to support pregnancy. Prolactin is primarily secreted by the anterior pituitary, so it is not a placental secretion product.

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