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': 'In a 40 years old male thrombus in the common femoral aery is because of - \nSelect and explain. \nA. Atheroma, B. Thrombangits obliterans, C. Raynauds disease, D. Abdominal mass', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Atheroma", 'role': 'assistant'}]