About which day in a normal human menstrual cycle does rapid secretion of $LH$ (popularly called $LH$ surge) normally occurs?
About which day in a normal human menstrual cycle does rapid secretion of $LH$ (popularly called $LH$ surge) normally occurs?
- [AIPMT 2011]
- A
$14^{th}$ day
- B
$20^{th}$ day
- C
$5^{th}$ day
- D
$11^{th}$ day
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- [AIIMS 2005]