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 of spine is a - \nSelect and explain. \nA. Compression Fracture, B. Extension injury, C. Direct injury, D. Flexion - rotation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Burst fracture (crushed communited fracture) is caused by axial (vertical) compression injury.', 'role': 'assistant'}]