The following has been found to act as a male contraceptive without affecting libido or potency:

Correct Answer: C

Rationale: Rationale for Correct Answer C (Centchroman): 1. Centchroman is a non-hormonal male contraceptive that acts by inhibiting sperm production without affecting libido or potency. 2. It is a selective estrogen receptor modulator, which helps in contraception without affecting male sexual function. 3. Centchroman's mechanism of action does not interfere with testosterone levels or sexual desire, making it an effective male contraceptive option. 4. Studies have shown that centchroman is safe and well-tolerated, making it a suitable choice for male contraception. Summary of Incorrect Choices: A. Cyproterone acetate: It is a hormonal contraceptive that can affect libido and potency due to its anti-androgenic properties. B. Goserelin: It is a hormonal drug that suppresses testosterone production, potentially affecting libido and potency. D. Gossypol: It is a plant-derived compound that can impact sperm production and fertility without preserving libido and potency.

Correct Answer: B

Rationale: Rationale: Levonorgestrel is the recommended emergency contraceptive. Choice A includes ethinylestradiol, which is not needed. Choice C uses Mifepristone, which is not typically used for emergency contraception. Choice D is incorrect because it includes options A and C, which are not recommended. Choice B, Levonorgestrel 0.75 mg taken twice 12 hours apart, is the correct regimen as per guidelines. It provides effective protection against unintended pregnancy without the need for additional unnecessary components.

Correct Answer: A

Rationale: The correct answer is A: Combined estrogen + progestin oral pill. This form of hormonal contraception is the most popular because it is highly effective in preventing pregnancy by inhibiting ovulation, thickening cervical mucus, and altering the endometrium. It is easy to use, reversible, and offers additional non-contraceptive benefits like reducing menstrual cramps and acne. Phased estrogen + progestin oral pill (B) and postcoital estrogen + progestin pill (C) are not commonly used methods. Depot progestin injection (D) is effective but less popular due to the need for healthcare provider administration and potential side effects like irregular bleeding.

Correct Answer: C

Rationale: The correct answer is C: First term abortion. Mifepristone is primarily indicated for medical abortion in the first trimester of pregnancy. It works by blocking the hormone progesterone, leading to the detachment of the embryo from the uterine wall. Endometriosis (A) is not a primary indication for mifepristone. Cushing's syndrome (B) is typically treated with medications that lower cortisol levels, not mifepristone. Second term abortion (D) is usually performed through other methods like dilation and curettage, not with mifepristone.

Correct Answer: B

Rationale: The correct answer is B: Dysfunctional uterine bleeding. Progestins are used alone for this indication to help regulate the menstrual cycle without the need for estrogen. In dysfunctional uterine bleeding, the endometrium sheds irregularly due to hormonal imbalances. Progestins can help stabilize the endometrium and control bleeding. A: Threatened abortion - Progestins are not typically used alone for this indication as estrogen may also be needed to support the pregnancy. C: Hormone replacement therapy - Progestins are usually combined with estrogen in hormone replacement therapy to protect the uterine lining. D: Premenstrual tension - Progestins alone are not commonly used for this condition, as estrogen may also play a role in managing premenstrual symptoms.