Question

Oral contraceptives contain
A. Progesterone
B. LH
C. Oxytocin
D. Sterols

Answer 1

Oral contraceptives or the so-called birth-control pills are used in prevention of pregnancy. Two female sex hormones are Estrogen and progestin. Combinations of these two hormones, the estrogen and progestin work by preventing ovulation which is the release of eggs from the ovaries. This combination of hormones changes the lining of the uterus to prevent pregnancy from developing and also changes the mucus at the cervix to prevent sperm from entering into it.

Complete answer:
Option A. Progesterone: A hormone that occurs naturally in the body is the progesterone. This hormone can also be made in the laboratory for various purposes such as oral contraceptives and hormone replacement therapy. Abnormal menstrual periods and menopausal symptoms can occur if progesterone levels are changed. For implantation of the fertilized egg in the uterus and maintenance of pregnancy, this hormone plays an important role. Oral contraceptives contain progesterone.
Hence option A is the correct answer.
Option B. LH: The LH or luteinizing hormone is a hormone that is produced by gonadotropic cells in the anterior pituitary gland. Gonadotropin-releasing hormone from the hypothalamus regulates production of LH. They are not used in oral contraceptives.
Hence option B is not correct.
Option C. Oxytocin: A hormone and a neurotransmitter which is involved in childbirth and breast-feeding is called the oxytocin. Oxytocin is not used in the production of oral contraceptives.
Hence option C is not correct.
Option D. Sterols: By helping to regulate the process of development, sterols play an important role in cell signaling. They are not used to produce oral contraceptives.
Hence option D is also not correct.

Hence, Option A. Progesterone is the correct answer.

Note:
Sometimes, oral contraceptives are used to treat heavy or irregular menstruation and endometriosis. The oral contraceptives come in packets of $21$, $28$, or $91$ tablets. This is to be taken by mouth once a day, every day or almost every day of a regular cycle. There are slightly different medications or doses in different brands of oral contraceptives, and are to be taken in slightly different ways. These have different risks and benefits.