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Without fertilisation, corpus luteum degeneration leads to menstruation because:

AFSH destroys the uterine wall
BThe placenta releases oxytocin
CProgesterone support falls
DThe ovary becomes the placenta
Answer & Solution
Correct answer: C. Progesterone support falls
The corpus luteum normally secretes progesterone to maintain the endometrium. Its degeneration removes that hormonal support, so the endometrium breaks down and menstruation begins.
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