This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
[{'content': 'A 40 year old male female patient on long term steroid therapy presents with recent onset of severe pain in the right hip. Imaging modality of choice for this problem is - \nSelect and explain. \nA. CT scan, B. Bone scan, C. MRI, D. Plain x-ray', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Recent onset of severe hip pain with given history of long term use of steroid suggests the diagnosis of Avascular necrosis. The investigation of choice for Avascular necrosis is MRI Hence the answer here is MRI', 'role': 'assistant'}]