The rhythm method of temporary contraception is based on which feature of the menstrual cycle?

  • A
    Consecutive menstrual cycles are separated by $28$ days.
  • B
    The luteal phase of the menstrual cycle has a duration of $14$ days.
  • C
    $A$ week after ovulation is the only safe period for sexual intercourse.
  • D
    $A$ week before and after ovulation are safe periods for sexual intercourse as the chances of fertilization are less.

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