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 is a prodrug ? 
Select and explain. 
A. Lisinopril, B. Enalapril, C. Chlorpromazine, D. Dopamine
B: Enalapril
Answer: B: Enalapril 
Explanation: All ACE inhibitors are prodrugs except captopril and lisinopril.