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
[{'content': "True regarding Hangman's fracture is: \nSelect and explain. \nA. Odotoid process fracture of C2, B. Spondylolisthesis of C2 over C3, C. Whiplash injury, D. Fracture of hyoid bone", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Spondylolisthesis of C2 over C3', 'role': 'assistant'}]