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': 'Synaitis of Hip is \nSelect and explain. \nA. Is self limiting, B. Common in < 5 years of age, C. Markedly increased ESR, D. Due to Trauma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]