Which of the following is used in most of the oral contraceptives?

Explanation

Oral contraceptives are used to prevent pregnancy. Progesterone is primarily responsible for preventing pregnancy. So, it is taken as an oral contraceptive and is used in birth control pills. This hormone develops the endometrium and make it receptive for the implantation of the zygote and on the other hand prevents ovulation from ovaries. Progesterone inhibits further FSH secretion from the pituitary, thus preventing any more follicles from ripening. It also afects the uterus, causing further thickening and vascularization of its wall, and other areas of the female body, preparing it for maintaining the state of pregnancy. It suppresses ovulation. That is why it is a major constituent of birth control pill.