Which of the following have been found to be very effective as emergency contraceptive as they could be used to avoid possible pregnancy due to rape if given within $72$ hours?

$A.$ Administration of progestogens
$B.$ Progestogen-estrogen combination
$C.$ $IUDs$ inserted within $72$ hours of coitus
 

Give differences : Natural method of family planning and Artificial method of family planning

Removal of gonads cannot be considered as a contraceptive option. Why?

……. IUDs, in addition, make the uterus unsuitable for implantation and the cervix hostile to the sperms.

Which of the following is a wrong match between the type of contraception and its function?

Contraceptive$\quad$ device Function