The birth control pill contains . . . . . . .

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

The action of a vaginal diaphragm is

Assertion : Copper $-T$ is an effective contraceptive device in human females.
Reason : Copper $-T$ prevents passage of sperms from vagina upwards into fallopian tubes.

What is the primary effect of lactational amenorrhea?

$A$: Surgical methods,also called sterilization,are generally advised for the male/female partner as a terminal method to prevent any more pregnancies.
$R$: These techniques are highly effective but their reversibility is poor.