This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Spinal Injuries, Subject name: Orthopaedics
[{'content': "Whip-lash' injury is caused due to: \nSelect and explain. \nA. A fall from a height, B. Acute hyperextension of the spine, C. A blow on top to head, D. Acute hyperflexion of the spine", 'role': 'user'}, {'content': 'Answer: B \nExplanation: (b) Acute hyperextension of the spine- Whiplash injury is caused by sudden unexpected hyperextension of cervical spine followed immediately by flexion.', 'role': 'assistant'}]