This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Cancer, Subject name: Pharmacology
All are alkylating agent except: 
Select and explain. 
A. Busulfan, B. Melphalan, C. Cladribine, D. Cyclophosphamide
C: Cladribine
Answer: C: Cladribine 
Explanation: Ans. C. CladribineAlkylating agents are cyclophosphamide, ifosfamide, busulfan melphalan, carmustine, lomustine. cladribine is antimetabolite.