$ . . . . . . $ is a natural contraceptive method.

The diaphragm is a rubber dome-shaped structure that stops sperms from entering into:

Which organization developed the spermicide 'Saheli' (or related contraceptive research)?

Which of the following have been found to be very effective as emergency contraceptives,as they could be used to avoid possible pregnancy due to rape or casual unprotected intercourse if administered within $72$ hours?
$A.$ Administration of progestogens
$B.$ Progestogen-estrogen combinations
$C.$ $IUDs$ inserted within $72$ hours of coitus

In male sterilization,$A$ is cut and tied. This process is called $B$. Fill in the correct option for $A$ and $B$.

Which of the following is not a natural method of contraception?