This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Anterior cruciate ligament prevents : \nSelect and explain. \nA. Anterior dislocation of tibia, B. Posterior dislocation of tibia, C. Anterior dislocation of femur, D. Posterior dislocation of femur', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Anterior dislocation of tibia', 'role': 'assistant'}]