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: Orthopaedics
Regarding Hangman's fracture true is- 
Select and explain. 
A. High post admission mortality, B. Most common axis fracture, C. Surgical treatment is necessary, D. Union almost always occurs
D: Union almost always occurs
Answer: D: Union almost always occurs 
Explanation: It is the second most common type of Axis (C2) fracture, second only to odontoid fractures.
Fatalities are common, However, the neurological deficit is unusual as the fracture of posterior arch decompress the spinal cord.
Most of the fatalities occur at the scene of injury, acute post admission mortality is low.
Successful healing of C2 traumatic spondylolishesis is reported to approach 95%. This is most commonly achieved with non-operative measures, even in the presence of displacement of pars inter-articularis.