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': "The drug of choice in Chorio ' Carcinoma is: \nSelect and explain. \nA. Methotrexate, B. Actinomycin-D, C. Vincristine, D. 6-thioguanine", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methotrexate', 'role': 'assistant'}]