This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Orthopaedics
[{'content': 'Which is the investigation of choice for a sport injury of the knee? \nSelect and explain. \nA. Ultrasonography, B. Plain radiography, C. Arthrography, D. Arthroscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (d) Arthroscopy- The usual protocol for sports injury in a suspected case is to diagnose the injury by MRI and if diagnosis is in doubt than arthroscopy can confirm the lesion.', 'role': 'assistant'}]