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 site for venous thrombosis ? \nSelect and explain. \nA. Popliteal vein, B. Soleal vein, C. Femoral vein, D. Internal iliac vein', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' Soleal vein", 'role': 'assistant'}]