This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bones Joints and Ligaments, Subject name: Anatomy
[{'content': 'ACL prevents: \nSelect and explain. \nA. Anterior dislocation of femur, B. Posterior dislocation of tibia, C. Lateral dislocation of tibia, D. Posterior dislocation of femur', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anterior cruciate ligament (ACL) prevents posterior displacement of femur(PDF) on tibia and the anterior displacement of tibia on femur, as well. Posterior cruciate ligament- prevent anterior displacement of femur on tibia and the posterior displacement of tibia on femur, as well.', 'role': 'assistant'}]