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
Proliferation independent agents include all the following except : 
Select and explain. 
A. Vincristine, B. Carmustine, C. Melphalan, D. Cyclophosphamide
A: Vincristine
Answer: A: Vincristine 
Explanation: None