Ovulation does not occur during pregnancy in the human female because

  • A

    The follicles are not influenced by the level of progesterone in the blood

  • B

    The corpus luteum and later the placenta produce large amounts of progesterone

  • C

    The corpus luteum generates as luteinising hormone is no longer produced

  • D

    The embryo produces hormones which retard the production of maternal follicle stimulating hormones

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