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: Anatomy
[{'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: * Whiplash Injury is caused by sudden unexpected hyperextension of cervical spine followed immediately by flexion. <img alt="" src=" /> Ref: Apley\'s 9th/e p.820', 'role': 'assistant'}]