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
[{'content': 'Ifosfamide belongs to which class: \nSelect and explain. \nA. Alkylating agent, B. Antimetabolite, C. Taxanes, D. Antibiotics', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Alkylating agent', 'role': 'assistant'}]