Which one of the following statements is incorrect about menstruation?

  • A

    At menopause in the female, there is especially abrupt increase in gonadotropic hormones

  • B

    The beginning of the cycle of menstruation is called menarche

  • C

    During normal menstruation about $40 \;ml$ blood is lost

  • D

    The menstrual fluid can easily clot

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  • [AIPMT 1991]