Correct Answer: A

Rationale: The correct answer is extremity paresthesias. Streptomycin, used to treat infections like Subacute Bacterial Endocarditis, can cause paresthesias in the hands and feet as an adverse effect. Monitoring for this symptom is vital to detect and manage it promptly.

Correct Answer: C

Rationale: Propranolol undergoes extensive first-pass metabolism in the liver. When administered orally, propranolol is extensively metabolized by the liver before reaching systemic circulation, leading to reduced bioavailability. This process is known as first-pass hepatic metabolism, which significantly affects the drug's effectiveness and necessitates higher oral doses compared to other routes of administration.

Correct Answer: A

Rationale: Spironolactone is classified as a potassium-sparing diuretic. It works by inhibiting sodium reabsorption in the kidneys while promoting the retention of potassium and hydrogen ions. This mechanism of action helps in reducing fluid retention without causing excessive loss of potassium, which is a common side effect of other diuretics.

Correct Answer: A

Rationale: Hydrochlorothiazide is a diuretic that can cause potassium loss, leading to hypokalemia. Monitoring potassium levels is crucial to prevent potential adverse effects such as cardiac arrhythmias and muscle weakness.

Correct Answer: B

Rationale: Creatinine levels should be monitored to evaluate vancomycin's effect on kidney function. Vancomycin can be nephrotoxic, so monitoring creatinine levels helps assess renal function and ensure that the medication is not causing harm to the kidneys.