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': 'All of the following are synthetic dressing in burn wound except \nSelect and explain. \nA. Opsite, B. Biobrane, C. Dacron, D. Integra', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dacron is vascular graft material.', 'role': 'assistant'}]