Final answer:
Lisinopril is the correct answer as it is an ACE inhibitor commonly prescribed for the treatment of essential hypertension, blocking the conversion of angiotensin I to angiotensin II.
Step-by-step explanation:
The correct drug that supports a coding clinic response for essential hypertension would be Lisinopril. Lisinopril is part of a class of medications known as angiotensin converting enzyme inhibitors (ACE inhibitors), which are commonly prescribed for the treatment of hypertension. These medications work by blocking the ACE enzyme from converting angiotensin I to angiotensin II, thereby reducing its ability to constrict blood vessels and increase blood pressure.
In contrast, drugs such as HCTZ (a thiazide diuretic) and Captopril (another ACE inhibitor) also treat hypertension, but the question seems to be asking for a specific response tied to essential hypertension and a coding clinic context, which Lisinopril fits due to its prevalence in hypertension management protocols.