Noncontraceptive clinical uses of progestins are following:

Correct Answer: D

Rationale: The correct answer is D, "All of the above." Progestins have noncontraceptive clinical uses such as hormone replacement therapy, dysmenorrhea, and endometriosis. Progestins can help regulate hormone levels during menopause (A), reduce menstrual pain (B), and manage symptoms of endometriosis (C). Each of these uses is supported by scientific evidence and clinical practice. Therefore, the correct answer includes all the possible noncontraceptive clinical uses of progestins. The other choices are incorrect because they do not encompass all of the noncontraceptive clinical uses of progestins as listed in the question.

Correct Answer: D

Rationale: The correct answer is D: Increase the number of T-cells. Levamisole is an immunomodulatory drug that works by stimulating the production and proliferation of T-cells in the immune system. This mechanism helps in enhancing the immune response against pathogens and cancer cells. Explanation for other choices: A: Inhibiting CD3 receptor is not the mechanism of action of levamisole. B: Complement-mediated cytolysis of T lymphocytes is not related to the action of levamisole. C: Levamisole does not substitute for patient's deficient immunoglobulins; it works by increasing T-cell count.

Correct Answer: D

Rationale: Step-by-step rationale: 1. Disulfiram is a known aldehyde dehydrogenase inhibitor, used in the treatment of alcohol abuse. 2. It works by blocking the enzyme aldehyde dehydrogenase, leading to the accumulation of acetaldehyde. 3. This accumulation causes unpleasant symptoms when alcohol is consumed, discouraging its consumption. 4. Tazobactam and Sulbactam are beta-lactamase inhibitors, not related to aldehyde dehydrogenase. 5. Aminocaproic acid is a fibrinolysis inhibitor, not associated with aldehyde dehydrogenase inhibition. Summary: Disulfiram is the correct answer as it is a known aldehyde dehydrogenase inhibitor, while the other choices are unrelated to this enzyme inhibition.

Correct Answer: B

Rationale: Step-by-step rationale: 1. Cholestyramine is a bile acid sequestrant used to lower cholesterol. 2. The major side effects of cholestyramine are gastrointestinal disturbances, not hepatotoxicity. 3. Therefore, the statement that hepatotoxicity is a major side effect is FALSE. 4. Option B is the correct answer as it accurately reflects the lack of hepatotoxicity with cholestyramine. Summary: - Option A is incorrect because hepatotoxicity is not a major side effect of cholestyramine. - Option C "All" is incorrect as it implies that all statements are true, which is not the case. - Option D "None" is incorrect as there is a major side effect associated with cholestyramine, just not hepatotoxicity.

Correct Answer: A

Rationale: The correct answer is A (900-1200 mg) because phosphorus is an essential mineral required for various bodily functions like bone health and energy metabolism. The recommended daily allowance varies depending on age, gender, and health status, but generally falls within the range of 900-1200 mg for adults. Choice B (600-900 g) is incorrect because this amount is too high for phosphorus intake and could lead to potential health issues. Choice C (25 g) is incorrect as it is an extremely high amount of phosphorus intake, far exceeding the recommended daily allowance and could be harmful to health. Choice D (1.5-4 mg) is incorrect because this amount is too low for phosphorus intake and would not meet the body's daily requirements for this essential mineral.