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. Captopril, B. Enalapril, C. Ramipril, D. All
A: Captopril
Answer: A: Captopril 
Explanation: Ans. is 'a' i.e., Captopril o All ACE inhibitors are prod rugs except captopril and Lisinopril.