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
[{'content': 'ACL prevents \nSelect and explain. \nA. Anterior displacement of fibula, B. Posterior displacement of tibia, C. Anterior displacement of femur, D. Posterior displacement of femur', 'role': 'user'}, {'content': "Answer: D \nExplanation: Anterior cruciate ligament prevents Posterior dislocation of femur on tibia Anterior displacement of tibia on femur Ref: Gray's Anatomy The Anatomical Basics of Clinical Practice 41 e pg 1394.", 'role': 'assistant'}]