A patient with hypertension and angina is prescribed metoprolol. What is the primary mechanism of action of this drug?

✓ Correct Answer: Option C

Metoprolol is a selective beta-1 adrenergic receptor antagonist (beta-blocker). It primarily blocks beta-1 receptors in the heart, decreasing heart rate, contractility, and blood pressure, which is beneficial for hypertension and angina.