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: Surgery
[{'content': 'Fracture supracondylar fracture is usually caused by : \nSelect and explain. \nA. Hyper flexion injury, B. Axial rotation, C. Extension injury, D. Hyper extension injury', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Hyper extension injury', 'role': 'assistant'}]