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': 'Which is the investigation of choice for a sports injury of the knee - \nSelect and explain. \nA. Ultrasonography, B. Plain radiography, C. Arthrography, D. Arthroscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Investigation of choice for sports injuries of the knee is MRI.\nHowever, amongst the given options, arthroscopy is the best.', 'role': 'assistant'}]