Which of the following medications is also classified as an ACE inhibitor?

Enalapril is classified as an ACE inhibitor, which stands for Angiotensin-Converting Enzyme inhibitor. These medications are specifically designed to inhibit the action of the angiotensin-converting enzyme, which plays a crucial role in the renin-angiotensin system. By blocking this enzyme, enalapril helps to decrease the production of angiotensin II, a potent vasoconstrictor that can increase blood pressure. As a result, ACE inhibitors like enalapril are commonly used to treat conditions such as hypertension and heart failure, promoting vasodilation and reducing blood volume, which ultimately leads to lowered blood pressure and reduced strain on the heart.

Other options represent different classes of medications: Losartan is classified as an angiotensin II receptor blocker (ARB), Amlodipine is a calcium channel blocker, and Sildenafil is a phosphodiesterase type 5 inhibitor used primarily for erectile dysfunction and pulmonary hypertension. Each serves different therapeutic purposes and has distinct mechanisms of action, highlighting why enalapril stands out as the correct choice in this question.