Out of the following options,identify which one is $NOT$ a natural method of contraception.

The action of jellies and creams used as contraceptives is:

In birth control methods,which one is an intra-uterine device?

Give differences: Vasectomy and Tubectomy.

Which of the following statements is not correct about oral contraceptive pills?

What is true about 'Saheli'?
$I$. Developed at $CDRI$,Lucknow
$II$. Contains a steroidal preparation
$III$. 'Once-a-week' pill
$IV$. Many side effects
$V$. High contraceptive value
$VI$. Very few side effects
$VII$. Low contraceptive value