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
Jefferson fracture is: 
Select and explain. 
A. C2 fracture, B. C1 fracture, C. Fracture of talus, D. Atlanto- axial dislocation
B: C1 fracture
Answer: B: C1 fracture 
Explanation: Ans. B. C1 fracture* Jefferson's fracture: Sudden severe load on the top of the head may cause a 'bursting' force which fractures the ring of the atlas.* There is no encroachment on the neural canal and, usually, no neurological damage.