This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following ACE inhibitor is NOT a prodrug ? 
Select and explain. 
A. Fosinopril, B. Enalapril, C. Ramipril, D. Lisinopril
D: Lisinopril
Answer: D: Lisinopril 
Explanation: None