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': 'Revascularization of skin graft occurs after \nSelect and explain. \nA. 2 days, B. 3 days, C. 4 days, D. 5 days', 'role': 'user'}, {'content': 'Answer: D \nExplanation: After 5 days, revascularization occurs.', 'role': 'assistant'}]