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: Surgery
[{'content': "Buerger's disease is caused by: \nSelect and explain. \nA. Asbestosis, B. Alcohol, C. Cigarette smoking, D. Drug abuse", 'role': 'user'}, {'content': "Answer: C \nExplanation: Buerger's disease is caused by vasculitis of vessels of the hands and feet. This disorder is highest among males aged\xa020 to 40, who have a history of smoking or chewing tobacco.", 'role': 'assistant'}]