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': 'which of the following graft is more resistant to infection and trauma: \nSelect and explain. \nA. Thiersch graft., B. Wolfe graft., C. Partial thickness graft., D. Both BC', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]