Which of the following is a common medication for treating hypertension?

ACE inhibitors are a common class of medication specifically used to treat hypertension, or high blood pressure. They work by blocking the action of angiotensin-converting enzyme (ACE), which plays a key role in the body's renin-angiotensin system. This system is responsible for regulating blood pressure and fluid balance. By inhibiting ACE, these medications lead to the dilation of blood vessels, reducing resistance, and subsequently lowering blood pressure. They are widely prescribed because they not only help in controlling hypertension but also provide cardiovascular benefits, such as reducing the risk of heart attack and stroke.

In contrast, the other options do not serve the purpose of treating hypertension. Antidepressants focus on mental health disorders, antibiotics target bacterial infections, and antihistamines are mainly used to alleviate allergy symptoms. Thus, while each of these medications plays an essential role in their respective areas, ACE inhibitors are the correct choice for managing hypertension.