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

Select the odd one out.

$A$: Surgical methods block gamete transport and thereby prevent conception.
$R$: The surgical method used in the male for this purpose is called vasectomy.

Give information about natural methods useful as contraceptives.

Which of the following methods of birth control is considered the most effective?

Differentiate between the natural method of family planning and the artificial method of family planning.