Which of the following principles are used to prevent $STD$ infection?
$(i)$ Avoid sex with unknown partners
$(ii)$ Use condoms during coitus
$(iii)$ Blood transfusion
$(iv)$ All of these

  • A
    $i, iii$
  • B
    $i, ii$
  • C
    $iii, iv$
  • D
    $ii, iv$

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