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: Anatomy
[{'content': "Hangman's fracture is- \nSelect and explain. \nA. Subluxation of C5 over C6, B. Fracture dislocation of C2, C. Fracture dislocation of ankle joint, D. Fracture of odontoid", 'role': 'user'}, {'content': "Answer: B \nExplanation: * Hangman's fracture is bilateral fracture of the pars interaicularis of axis (c2) with traumatic sponsylolisthesis of axis (C2) over C3 veebrae. Thus Hangman's fracture is not simply a fracture, but fracture dislocation of axis (C2). Ref: Surgical treatment of ohopedic trauma 4th/e p.116", 'role': 'assistant'}]