This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which is not a alkylating agent? 
Select and explain. 
A. Cyclophosphamide, B. Chlorambucil, C. 5-FU, D. Melphalan
C: 5-FU
Answer: C: 5-FU 
Explanation: 5-FU is an metabolite