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': 'Latency period in distraction osteogenesis: \nSelect and explain. \nA. 4-7 days, B. 4 weeks, C. 15 days, D. 1 month', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Latency period/Delay\nFracture healing is allowed to occur.\xa0This period generally ranges from 4-7 days (AIIMS -2012), allows for the initial fracture healing to occur, by callus formation in order to bridge the cut bone segments.', 'role': 'assistant'}]