$.........$ prevents conception by blocking the entry of sperms through the cervix.

All the following statements are correct about 'Saheli',but one is wrong. Which one is wrong?

Which of the following contraceptives could be effective in avoiding pregnancy if used within $72$ hours after casual unprotected intercourse?

The technique used to block the passage of sperm in males is . . . . . . .

Match the contraceptive methods given under column-$I$ with their examples given under column-$II$. Select the correct choice from those given below.

Column $I$	Column $II$
$A$. Chemical	$p$. Tubectomy and vasectomy
$B$. $IUDs$	$q$. Copper $T$ and loop
$C$. Barriers	$r$. Condom and cervical cap
$D$. Sterilisation	$s$. Spermicidal jelly and foam
	$t$. Coitus interruptus and calendar method

Periodic abstinence is a method of birth control that involves avoiding sexual intercourse during which phase?