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: Orthopaedics
[{'content': 'Management of posteromedial bowing of tibia in a 6 months old boy \nSelect and explain. \nA. Osteotomy, B. Cast with ponsetti method, C. ORIF, D. Observation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]