What is the purpose of contraceptive pills?
$I$. They inhibit ovulation and implantation
$II$. They alter the quality of cervical mucous to prevent or retard the entry of sperms
$III$. They prevent the ejaculated semen from entering the female vagina
$IV$. They inhibit spermatogenesis

  • A
    $I, II \text{ and } IV$
  • B
    $I, II \text{ and } III$
  • C
    $I \text{ and } II$
  • D
    $I, II, III \text{ and } IV$

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