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': 'Burst fracture is due to \nSelect and explain. \nA. Vertical compression, B. Whiplash injury, C. Wedge compression, D. Avulsion fracture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]