The correct option is D Both b and c
Emergency contraception is useful to stop unwanted pregnancy. They are used in case of unprotected intercourse or used in cases when contraceptives fail during intercourse. They are also helpful in cases of sexual assault and rape. Emergency contraception employs the use of pills like i-Pill and Unwanted-72.
Emergency pills need to be taken within 5 days of intercourse as it normally takes 3 - 4 days for sperm to reach the egg for fertilisation. Administration of progestogens or progestogen-estrogen combinations within 72 hours of coitus have been found to be very effective as emergency contraceptives (morning after pills).
The pills contain formulations of Levonorgestrel that prevent pregnancy, stop ovulation and also thicken the cervical mucus to make it difficult for the sperm to travel to the ovum.