Find out the correct aspects of lactational amenorrhoea.
$I$. Ovulation does not occur during the lactational period.
$II$. Chances of the failure of contraception are almost nil up to six months following parturition.
$III$. Side effects are almost nil.
$IV$. It is a natural method of contraception.
$V$. It increases phagocytosis of sperms.

• A
  $II, III, IV$ and $V$
• B
  All except $V$
• C
  $I, II, III$ and $IV$
• D
  All of these