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The corpus luteum is a temporary endocrine structure involved in ovulation and early pregnancy. The main secretory product of corpus luteum is:

1. Estrogen, which is required for the establishment and maintenance of pregnancy.
2. Progesterone, which is required for the establishment and maintenance of pregnancy.
3. Testosterone, which is required for the establishment and maintenance of pregnancy.
4. Relaxin, which is required for the establishment and maintenance of pregnancy.

Correct answer: Progesterone, which is required for the establishment and maintenance of pregnancy.

Solution

The corpus luteum primarily secretes progesterone, which maintains the endometrium and supports implantation and early pregnancy. Estrogen is also produced, but progesterone is the main secretory product.

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