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 type of injury causes more damage to the semi-lunar cailage in the Knee \nSelect and explain. \nA. Flexion and extension at the ankle, B. Rotation on a flexed knee, C. Rotation on an extended knee, D. Squatting position', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Rotation on flexed knee', 'role': 'assistant'}]