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: Orthopaedics
[{'content': 'Bumper fracture is \nSelect and explain. \nA. Lateral tibial condyle fracture, B. Medial  tibial condyle fracture, C. Calcaneum fracture, D. Sacrum fracture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]