The currently used injectable hormonal contraceptive contains:

Correct Answer: A

Rationale: The correct answer is A: Long acting progestin. Injectable hormonal contraceptives typically contain progestin alone, as it suppresses ovulation and thickens cervical mucus. Estrogen is not commonly used in injectable contraceptives due to its higher risk of side effects like blood clots. Chorionic gonadotropin is not a component of injectable contraceptives and is typically used in fertility treatments. Therefore, choice A is correct as it aligns with the mechanism of action and formulation of injectable hormonal contraceptives.

Correct Answer: D

Rationale: Step-by-step rationale for choice D being correct: 1. Oral mifepristone is a progesterone receptor antagonist, leading to detachment of the pregnancy. 2. Oral misoprostol, a prostaglandin, causes uterine contractions and expulsion of the products of conception. 3. This regimen is safe, effective, and widely used for early pregnancy termination. 4. Choice A, B, and C involve different medications and routes not typically used for nonsurgical termination of early pregnancy.

Correct Answer: C

Rationale: Step-by-step rationale: 1. Mifepristone is an antiprogestin as it competitively inhibits progesterone receptors. 2. Gemeprost is a prostaglandin analog, not an antiprogestin. 3. Megestrol is a progestin, promoting progesterone-like effects. 4. Tamoxifen is a selective estrogen receptor modulator, not an antiprogestin. Summary: A, B, and D are incorrect as they do not possess antiprogestin properties. Mifepristone is the correct choice due to its specific mechanism of action as an antiprogestin.

Correct Answer: A

Rationale: The correct answer is A: Rise in body temperature. Progesterone does not directly cause a rise in body temperature; this is primarily regulated by the hypothalamus. Progesterone's main actions include endometrial proliferation, proliferation of acini in the mammary gland, and suppression of cell-mediated immunity. Endometrial proliferation prepares the uterus for implantation, mammary gland proliferation prepares for lactation, and suppression of immunity prevents rejection of the fetus during pregnancy. Other choices are incorrect because they are well-documented actions of progesterone.

Correct Answer: D

Rationale: The correct answer is D: Improved lipid profile. Tamoxifen citrate therapy does not have a direct effect on improving lipid profile. A: Reduction in recurrence rate of breast cancer - Tamoxifen is used to reduce the risk of breast cancer recurrence. B: Improved bone mass - Tamoxifen can help maintain or improve bone density. C: Suppression of menopausal hot flushes - Tamoxifen can help reduce menopausal symptoms like hot flushes. In summary, choices A, B, and C are benefits of tamoxifen therapy, while choice D is not supported by evidence.