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': 'Not used as graft material in peripheral vascular disease - \nSelect and explain. \nA. Dacron graft, B. Vein, C. PTFE, D. PVC', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., PVC", 'role': 'assistant'}]