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: Surgery
Most common movemnet force involved in fractures of the spine is which of the following? 
Select and explain. 
A. Flexion, B. Extension, C. C Rotation, D. Compression
A: Flexion
Answer: A: Flexion 
Explanation: Flexion injury is the commonest spinal injury. Ref: Essential ohopedics by Maheshwari 3rd Edition, Page 144,259,260.