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
&;Whip-lash' injury is caused due to - 
Select and explain. 
A. A fall from a height, B. Acute hyperextension of the spine, C. A blow on top to head, D. Acute hyperflexion of the spine
B: Acute hyperextension of the spine
Answer: B: Acute hyperextension of the spine 
Explanation: Whiplash injury : acceleration injury , cervical sprain syndrome , soft tissue neck injury * it is an unconventional & inconsequential ligamentous injury of the cervical spine allegedly due to an extension injury following a rear end collision in an A * clinical features : symptoms - upper neck pain become worse with movement - occipital headache - neck stiffness - rarely veigo ,auditory or visual disturbance : sign - decreased range of movements - neck muscles spasm * investigation - x- ray usually normal .MRI helps to make diagnosis * treatment - conservative REF : MAHESWARI 9TH ED