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': 'Congenital Coxa yarn is treated by - \nSelect and explain. \nA. Fixation by SP Nail, B. Osteotomy, C. Bone grafting, D. Traction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treatment is by a subtrochanteric corrective osteotomy.', 'role': 'assistant'}]