What care is to be taken choosing a contraceptive method ?

$A$ : Surgical method blocks gamete transport and thereby prevents conception.
$R$ : Surgical method used in the male for this purpose is called vasectomy.

The method of sterilisation 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.

$A$ sterilisation technique in females which blocks gamete transport and thereby prevents conception is