Correct Answer - D
Unprotected intercourse without regard to the time of the month carries an 8% incidence of
pregnancy, an incidence that can be reduced to 2% by the use of emergency contraceptives within 72 hours of unprotected intercourse. 0.75 mg levonorgestrel are now approved for postcoital contraception and are available over the counter for women aged >17 years. Levonorgestrel is more effective and is associated with fewer side effects than the combination estrogen-progestin regimens Basically the methods used interfere with the physiological events before implantation, for e.g. inhibition or delaying of ovulation or interference with postovulatory events necessary for implantation & longevity of the blastocyst.
Ref: Hall J.E. (2012). Chapter 347. The Female Reproductive System, Infertility, and Contraception. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo (Eds), Harrison's Principles of Internal Medicine, 18e.
14June 25, 2026 10.8K 5
