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': "Pawlik harness is used in \nSelect and explain. \nA. Perthe's disease, B. Coxa valgum, C. Developmental dysplasia of hip, D. Slipped capital femoral epiphysis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]