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
Which type of injury causes more damage to the semi-lunar cailage in the Knee 
Select and explain. 
A. Flexion and extension at the ankle, B. Rotation on a flexed knee, C. Rotation on an extended knee, D. Squatting position
B: Rotation on a flexed knee
Answer: B: Rotation on a flexed knee 
Explanation: B i.e. Rotation on flexed knee