This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thigh, Knee,Leg,Foot & Ankle injuries, Subject name: Orthopaedics
[{'content': 'Which of the following structure is not a pa of knee extensor mechanism \nSelect and explain. \nA. Quadriceps tendon, B. Biceps femoris, C. Tibial tubercle, D. Patella tendon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The biceps femoris is not pa of the extensor mechanism, but instead performs knee flexion. The other muscles are pa of the knee extensor mechanism.', 'role': 'assistant'}]