This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arterial Disorders, Subject name: Surgery
[{'content': 'Best femoropopliteal bypass graft- \nSelect and explain. \nA. PTFE, B. Autologus saphenous vein, C. Dacron, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Autologus saphenous vein", 'role': 'assistant'}]