Menstruation occurs because:
AEstrogen levels surge to a peak
BThe fertilised ovum is rejected by the uterus
COvarian follicles continue to grow
DIn the absence of fertilisation, the corpus luteum degenerates, progesterone falls, and the endometrium disintegrates
Answer & Solution
Correct answer: D. In the absence of fertilisation, the corpus luteum degenerates, progesterone falls, and the endometrium disintegrates
If fertilisation does not occur, the corpus luteum degenerates → **progesterone withdrawal** → endometrium disintegrates → menstrual flow begins, marking a new cycle.
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