Q.A contraceptive pill prevents ovulation by

Contraceptive methods fall into temporary and permanent categories. Temporary natural methods (periodic abstinence/rhythm method, continuous abstinence, coitus interruptus, lactational amenorrhoea) rely on timing or physiology rather than devices. Temporary barrier methods include chemical barriers (foaming tablets, jellies, creams), mechanical barriers (condoms; diaphragms, cervical caps and vaults), hormonal barriers (oral contraceptive pills that inhibit FSH/LH release, such as the combined pill or India's non-steroidal Saheli/centchroman), and intrauterine devices (IUDs) — copper-releasing (Cu T-380A, Multiload-375), hormone-releasing/IUS (Progestasert, LNG-20), and non-medicated (the Lippes loop) — which w …