Recommended phosphorus daily allowance is:

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.

Correct Answer: B

Rationale: The correct answer is B: Penicillin V. Penicillin V is gastric acid-resistant due to its stability against the acidic environment of the stomach, allowing it to be absorbed intact in the intestine. Penicillin G (choice A) is not acid-resistant and is inactivated by gastric acid. Carbenicillin (choice C) and Procain penicillin (choice D) are not designed to be acid-resistant and would be inactivated in the stomach as well. Penicillin V is the only option that can withstand the acidic conditions of the stomach, making it the correct choice in this scenario.

Correct Answer: D

Rationale: The correct answer is D: Streptomycin. First-line antimycobacterial drugs are those recommended as initial treatment for Mycobacterium tuberculosis infections. Streptomycin is considered a second-line drug due to its potential for serious side effects and development of resistance. Rifampin, Pyrazinamide, and Isoniazid are all first-line drugs supported by extensive clinical evidence and are preferred for initial therapy. Streptomycin is reserved for cases where first-line drugs are contraindicated or ineffective. Therefore, choosing Streptomycin as the correct answer is logical based on its classification as a second-line antimycobacterial drug.

Correct Answer: B

Rationale: The correct answer is B: Rimantadine. Rimantadine is a derivative of adamantane due to its molecular structure containing an adamantane core. This structural similarity allows rimantadine to exert antiviral activity against influenza A viruses by inhibiting the viral uncoating process. Didanozine (A) is a nucleoside reverse transcriptase inhibitor used in HIV treatment, not related to adamantane. Gancyclovir (C) and Foscarnet (D) are antiviral drugs used for treating herpesvirus infections and cytomegalovirus infections, respectively, but they are not derivatives of adamantane.

Correct Answer: C

Rationale: The correct answer is C: Furosemide. Furosemide is a loop diuretic commonly used to treat conditions such as edema and hypertension. In this case, the patient likely required a strong diuretic to manage fluid overload, which is best achieved with a loop diuretic like furosemide. Hydrochlorothiazide (A) is a thiazide diuretic, which is less potent than loop diuretics like furosemide. Mannitol (B) is an osmotic diuretic used for conditions such as cerebral edema and not typically included in routine therapeutic regimens. Fenoldopam (D) is a selective dopamine receptor agonist used for acute hypertension but is not commonly included in routine diuretic regimens like furosemide.