**Core Concept**
Food can significantly affect the oral bioavailability of certain medications, including angiotensin-converting enzyme inhibitors (ACE inhibitors). This is primarily due to the effect of food on gastric pH and gastrointestinal motility, which can influence the absorption of these drugs.

**Why the Correct Answer is Right**
The correct answer is a specific ACE inhibitor that is not significantly affected by food. This is because it is not subject to the same degree of first-pass metabolism or is not significantly affected by changes in gastric pH or gastrointestinal motility. For example, Lisinopril is not significantly affected by food and can be taken without regard to meals.

**Why Each Wrong Option is Incorrect**
**Option A:** Captopril is affected by food because its absorption is pH-dependent, and food can alter gastric pH. When taken with food, its absorption is decreased.
**Option B:** Enalapril is also affected by food because its absorption is influenced by the presence of food in the stomach, which can delay its absorption.
**Option C:** Quinapril is affected by food because its absorption is influenced by the presence of food in the stomach, which can decrease its absorption.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the bioavailability of medications can be affected by food, and some medications may need to be taken on an empty stomach or with food to optimize absorption. This is particularly important for medications like ACE inhibitors that have a narrow therapeutic index.

**Correct Answer: D. Lisinopril**