This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous Questions, Subject name: Medicine
[{'content': 'Smoking causes all cancers except: \nSelect and explain. \nA. Carcinoma endometrium, B. Oral cancer, C. Kidney cancer, D. Bladder cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: There does not appear to be a casual link between cigarette smoking and cancer endometrium. Smoking DOES NOT cause primary brain cancer. Kidney, oral cancer and bladder cancer are associated with smoking.', 'role': 'assistant'}]