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': "Most common cause of death in patients with Buerger's disease is - \nSelect and explain. \nA. Gangrene, B. Pulmonary embolism, C. Myocardial infarction, D. Carcinoma lung", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]