This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
Lateral dislocation of patella is prevented by 
Select and explain. 
A. Rectus femoris, B. Vastus medialis, C. Vastus lateralis, D. Vastus intermedius
B: Vastus medialis
Answer: B: Vastus medialis 
Explanation: The lateral border provides inseion to vastus lateralis in its upper one-third or half. The medial border provides inseion to the vastus medialis in its upper two-thirds or more. Ref : B D Chaurasia's Humsn Anatomy , seventh edition , volume 2 , pg, no. 22