What is true for 'lactational amenorrhea'?
(i) It means absence of menstruation.
(ii) Ovulation doesn't occur during the lactational period.
(iii) Chances of conception are almost nil upto six months following parturition.
(iv) Side effects are almost nil.
(v) It increases phagocytosis of sperms.
(vi) It is a natural method of contraception.

i, ii,iii,iv and vi

The correct answer is Option (4)- i, ii,iii,iv and vi

Natural methods work on the principle of avoiding chances of ovum and sperms meeting. Periodic abstinence, withdrawal or coitus interruptus, and lactational amenorrhea are natural methods.

Lactational amenorrhea (absence of menstruation) method is based on the fact that ovulation and therefore the cycle do not occur during the period of intense lactation following parturition. Therefore, as long as the mother breast-feeds the child fully, chances of conception are almost nil. However, this method has been reported to be effective only upto a maximum period of six months following parturition. As no medicines or devices are used in these methods, side effects are almost nil. Chances of failure, though, of this method are also high.