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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How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?

Which of the following hormone levels will cause release of ovum (ovulation) from the grafflan follicle$?$

  • [NEET 2020]

Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

  • [AIPMT 2009]