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': 'Investigation for injury of knee cailage \nSelect and explain. \nA. Aspiration, B. Ahrography, C. X-ray, D. Ahroscopy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Ahroscopy', 'role': 'assistant'}]