This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
[{'content': 'A 41 year female patient is taking steroids from long duration. Now she presents with onset of severe pain in the hip. Which imaging investigation can be used to diagnose this condition? \nSelect and explain. \nA. MRI, B. CT, C. USG, D. X-Ray', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Patient on long term steroids that presents with pain must be suffering from AVN( avascular necrosis). IOC to look for AVN is MRI.', 'role': 'assistant'}]