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': 'A thirty one year old male with neprhrotic syndrome complains of pain in right hip joint of 2 months duration. The movements at the hip are free but painful terminally. The most likely diagnosis is - \nSelect and explain. \nA. Tuberculosis of hip, B. Avascular necrosis of femoral head, C. Chondrolysis of hip, D. Pathological fracture of femoral neck', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This patient has : -\xa0\n\n\nNephrotic syndrome (must be taking steroids)\nPain in hip\nTerminal restriction of movements (in AVN, initially movements are restricted terminally only).\n\n\nThe diagnosis is AVN of Hip.\nIn all other three options movements of hip are grossly restricted (not terminally).', 'role': 'assistant'}]