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: Radiology
[{'content': 'Disk perforation is best examined by: \nSelect and explain. \nA. MRI, B. Arthrography, C. CT scan, D. Arthroscopy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Disk perforation and capsular tears are better detected with arthrography.\nTextbook of oral medicine, oral diagnosis and oral radiology, Ravikiran Ongole, pg-314', 'role': 'assistant'}]