Tick the antimycobacterial drug – hydrazide of isonicotinic acid:

Correct Answer: B

Rationale: Step 1: Isoniazid is a hydrazide of isonicotinic acid, making it the correct antimycobacterial drug. Step 2: Rifampin is a rifamycin antibiotic, not a hydrazide of isonicotinic acid. Step 3: Ethambutol is an antimycobacterial drug but not a hydrazide of isonicotinic acid. Step 4: Pyrazinamide is an antimycobacterial drug but not a hydrazide of isonicotinic acid.

Correct Answer: B

Rationale: The correct answer is B: Anastrozole. Aromatase inhibitors block the enzyme aromatase, which converts androgens into estrogens. Anastrozole specifically inhibits aromatase, reducing estrogen levels. Octreotide (A) is a somatostatin analogue, Flutamide (C) is an androgen receptor antagonist, and Tamoxifen (D) is a selective estrogen receptor modulator (SERM), not an aromatase inhibitor. Thus, the only drug among the choices that directly targets aromatase is Anastrozole.

Correct Answer: C

Rationale: The correct answer is C: Lovastatin. Lovastatin is a statin drug that inhibits HMG-CoA reductase, a key enzyme in cholesterol synthesis. It is effective in reducing LDL cholesterol levels and decreasing the risk of cardiovascular events. Niacin (choice A) is also used for hyperlipidemia but has more side effects. Cholestyramine (choice B) is a bile acid sequestrant used for high cholesterol but is less effective than statins. Nicotinamide (choice D) is a form of vitamin B3 and is not indicated for hyperlipidemia.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.