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The hormone HCG (Human Chorionic Gonadotropin) that is detected by pregnancy tests is produced by:
AThe hypothalamus during ovulation
BThe ovary's corpus luteum forever
CThe pituitary gland after fertilisation
DThe implanting embryo's trophoblast / placenta
Answer & Solution
Correct answer: D. The implanting embryo's trophoblast / placenta
HCG is produced by the trophoblast (later, placenta) starting ~6-7 days post-fertilisation. It signals the corpus luteum to keep producing progesterone, maintaining the early pregnancy. Pregnancy tests detect HCG in urine.
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