This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
[{'content': 'Best graft for aoic dissection: \nSelect and explain. \nA. Dacron, B. Autologous vein, C. Autologous aery, D. PTFE', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Best vascular graft for suprainguinal bypass: Dacron Best vascular graft for infrainguinal bypass: Saphenous vein Best vascular graft for aoa: Dacron', 'role': 'assistant'}]