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
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: (d) Union almost always occurs- Successful healing of C2 traumatic spondylolisthesis is reported to approach 95%. This is most commonly achieved with non-operative measures, even in the presence of displacement of pars inter-articularis.