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 associated with -a) Smokingb) Poor nutritionc) Alcohold) Prolonged standinge) Superficial thrombophlebitis \nSelect and explain. \nA. a, B. b, C. ae, D. ad", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]