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: Surgery
[{'content': 'Which is the investigation of choice for a spo injury of the knee? \nSelect and explain. \nA. Ultrasonography, B. Plain radiography, C. Ahrography, D. Ahroscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Ahroscopy', 'role': 'assistant'}]