A) At the time of embryonic implantation in the uterus.
B) With the formation of the placenta.
C) During the second trimester of pregnancy.
D) Just prior to parturition.
Correct Answer: C
Solution :
[c] The corpus luteum's production of hormones is essential for the maintenance of early pregnancy. During the second trimester, however, the placenta becomes fully formed and takes over hormone production, leading to degeneration of the corpus luteum.
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