A) Estrogen
B) Progesterone
C) Luteinizing hormone
D) Human chorionic gonadotropin
Correct Answer: D
Solution :
If fertilization occurs and the foetus is implanted in the endometrium, the tropholblast cells of the developing placenta secrete a hormone called Human Crionic Gonadotrophic hormone (HCG). This hormone like LH maintains the corpus luteum and secretion of progesterone and estradiol by it. These two hormones check the breakdown of the endometrium of the uterus. The absence of menstrual bleeding is the earliest sign of pregnancy.
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