Spermicidal.....

Action of vaginal diaphragm is

Amongst the following methods of contraception, which can be regarded as the most cost effective and easily reversible method of contraception?

Which of the following is an incorrect statement for periodic abstinence?

$A$ : Lactational amenorrhoea is one of natural method of birth control.
$R$ : High level of prolactin inhibits the secretion of gonadotropins

Find out the natural contraception methods $I$. Implantation $II$. Lactational (amenorrhoea) $III$. Condoms $IV$. Vasectomy $V$. Tubectomy $VI$. Sterilisation