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: Anatomy
[{'content': 'What structure contributes to the knee joint? \nSelect and explain. \nA. lateral malleolus of the fibula, B. tibial tuberosity, C. medial condyle of the tibia, D. lateral epicondyle of the femur', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The upper surface of the right\xa0tibia. (Anterior is at the top.) The\xa0medial condyle\xa0is the\xa0medial\xa0portion of the upper extremity of the tibia. It is the site of insertion for the Semimembranosus muscle.', 'role': 'assistant'}]