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': "Not used as classification for perthe's disease \nSelect and explain. \nA. Catterall classification, B. Salter Thompson classification, C. Stulberg classification, D. Salter Haris Classification", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]