 In a typical 28-day menstrual cycle, ovulation is triggered by:
AA peak in FSH alone on day 14
BA surge of LH (LH surge) around mid-cycle (day ~14) inducing rupture of the Graafian follicle
CA peak in progesterone on day 14
DWithdrawal of estrogen on day 14
Answer & Solution
Correct answer: B. A surge of LH (LH surge) around mid-cycle (day ~14) inducing rupture of the Graafian follicle
Both LH and FSH peak around mid-cycle, but the **rapid LH surge** specifically triggers rupture of the Graafian follicle → ovulation. (FSH supports follicular growth; LH 'pulls the trigger'.)
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