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': "Hangman's fracture is fracture of C2 \nSelect and explain. \nA. Dens fracture, B. Lamina, C. Pars interaicularis, D. Spinous process", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Pars interaicularis', 'role': 'assistant'}]