Which of the following drugs is a type of beta-blocker used for hypertension?

Atenolol is a type of beta-blocker that is commonly used to manage hypertension. Beta-blockers work by blocking the effects of adrenaline on beta-adrenergic receptors, which helps to reduce heart rate and lower blood pressure. By decreasing the heart's workload and helping blood vessels relax, atenolol can effectively control high blood pressure and improve cardiovascular health.

Lisinopril, the other medication mentioned, belongs to a class called ACE inhibitors, which work differently by preventing the conversion of angiotensin I to angiotensin II, leading to vasodilation and reduced blood pressure. Hydrochlorothiazide is a thiazide diuretic that helps lower blood pressure by promoting the excretion of sodium and water through the kidneys. Simvastatin is a statin used for lowering cholesterol levels, not specifically for hypertension. Each of these medications has a unique mechanism of action and is indicated for specific health conditions, which clarifies why atenolol stands out as the correct answer for a beta-blocker used to treat hypertension.