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 type of injury causes more damage to the semi-lunar cartilage 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: Injuries of the menisci (semilunar cartilages) are common in men under the age of 45 years.\nA tear is usually caused by a twisting force with the knee setniflexed or flexed.', 'role': 'assistant'}]