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
The forward displacement of tibia on the femur is prevented by 
Select and explain. 
A. Anterior cruciate ligament, B. Posterior cruciate ligament, C. Medical collateral ligament, D. Lateral collateral ligament
A: Anterior cruciate ligament
Answer: A: Anterior cruciate ligament 
Explanation: Anterior cruciate ligament prevents posterior displacement of the femur on the tibia and hyperextension of the knee joint. When the joint is flexed at a right angle, the tibia cannot be pulled anteriorly because it is held by the ACL.**watch the wordings carefullyReference: Chaurasia; 6th edition