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': 'Time duration for DO in a 8 month-old child: \nSelect and explain. \nA. 4-5 days, B. 21-30 days, C. 6-7 weeks or 4 to 6 weeks, D. 0-2 days', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]