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': 'An 11 year old 70 kg. child presents with limitation of abduction an internal rotation. There is tenderness in scarpas triangle. On flexing the hip the limb is abducted. The diagnosis is - \nSelect and explain. \nA. Perthes disease, B. Slipped capital femoral epiphyses, C. Observation hip, D. Tuberculosis hip', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]