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': 'Which antineoplastic agent is an antifolate drug ? \nSelect and explain. \nA. Methotrexate, B. Adriamycin, C. Vincristine, D. Cyclophosphamide', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Methotrexate", 'role': 'assistant'}]