This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'All are alkylating agents except \nSelect and explain. \nA. 5 flurouracil, B. Melphalan, C. Cycloohosphamide, D. Chlorambucil', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer Katzung 11/e p945 5 flurouracil is an Antimetabolite whereas Melphalan Cyclophosphamide .chlorambucil These are alkylating agents', 'role': 'assistant'}]