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
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 - 
Select and explain. 
A. Perthes disease, B. Slipped capital femoral epiphyses, C. Observation hip, D. Tuberculosis hip
B: Slipped capital femoral epiphyses
Answer: B: Slipped capital femoral epiphyses 
Explanation: None