Which hormone of the female body is suppressed by the oral contraceptive pills?

$A$ : Surgical method also called sterilisation 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.

Given below are four methods $(A-D)$ and theirmodes of action $(i-iv)$ in achieving contraception. Select their correct matching fromthe four options that follow

What is the purpose of surgical method of contraception?