The most important indication of mifepristone is:

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: C

Rationale: The correct answer is C: Carcinoma breast. Tamoxifen citrate is primarily indicated for the treatment of breast cancer. It is a selective estrogen receptor modulator that helps block the effects of estrogen on breast tissue. This is effective in hormone-receptor-positive breast cancer, helping to reduce the risk of recurrence and improve survival rates. A: Female infertility - Tamoxifen is not indicated for female infertility and can actually cause birth defects. B: Endometrial carcinoma - Tamoxifen use is associated with an increased risk of developing endometrial carcinoma. D: Endometriosis - Tamoxifen is not indicated for the treatment of endometriosis and may worsen the condition. Therefore, the correct answer is C as it aligns with the established use of tamoxifen citrate in the treatment of breast cancer.

Correct Answer: B

Rationale: The correct answer is B: Stimulate FSH and LH release. Progestins act to inhibit FSH and LH release from the pituitary gland, thus preventing ovulation. Progestins also help prevent uterine contractions, maintain the secretory endometrium, and block ovulation. Therefore, stimulating FSH and LH release would be contradictory to the main function of progestins, making it the incorrect choice.

Correct Answer: C

Rationale: Rationale: Oxytocin is the correct drug to facilitate labor as it is a hormone that stimulates uterine contractions. It helps to progress labor and delivery. Dopamine (A) is not used for labor induction. Leuprolide (B) is a gonadotropin-releasing hormone agonist, not used for labor. Prolactin (D) is not involved in uterine contractions.

Correct Answer: B

Rationale: The correct answer is B because epinephrine acts on both alpha and beta-adrenergic receptors. It causes bronchodilation (beta2 receptors) to improve airway function in asthma and increases heart rate, contractility, and conduction (beta1 receptors) to enhance cardiac function during cardiac arrest. Choices A, C, and D are incorrect because epinephrine does not primarily affect gluconeogenesis, vasodilation, or bronchoconstriction in these clinical scenarios.