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
What structure contributes to the knee joint? 
Select and explain. 
A. lateral malleolus of the fibula, B. tibial tuberosity, C. medial condyle of the tibia, D. lateral epicondyle of the femur
C: medial condyle of the tibia
Answer: C: medial condyle of the tibia 
Explanation: The upper surface of the right tibia. (Anterior is at the top.) The medial condyle is the medial portion of the upper extremity of the tibia. It is the site of insertion for the Semimembranosus muscle.