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: Surgery
[{'content': 'Double line sign on MRI is seen in: \nSelect and explain. \nA. AVN of hip, B. SCFE, C. TB hip, D. DDH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: AVN of HIP Clinically sectorial sign X rays - crescent sign MRI - double line sign Treatment - core decompression/osteotomies/vascularized bone graft/replacement', 'role': 'assistant'}]