This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around the Thigh & Knee, Subject name: Orthopaedics
[{'content': 'Anterior gliding of tibia on femur prevented by - \nSelect and explain. \nA. Anterior cruciate ligament, B. Posterior cruciate ligament, C. Ligament of humprey, D. Ligament of wriesberg', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Anterior cruciate ligament * ACL provides antero-posterior stability and prevents anterior gliding of tibia on femur and prevents hyperextension.* PCL prevents posterior gliding (subluxation) of tibia over femur.", 'role': 'assistant'}]