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': 'Oligospermia caused by- \nSelect and explain. \nA. Methotrexate, B. Hydroxychloroq uine, C. Leflunomide, D. D-penicillamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Methotrexate"Transient but reversible oligospermia has been repoed in males receiving high dose methotrexate for cancer chemotherapy".Defective oogenesis or spermatogenesis "Occurs in methotrexate therapy"', 'role': 'assistant'}]