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: Forensic Medicine
[{'content': 'Hanging is established by : \nSelect and explain. \nA. Fracture of hyoid cailage, B. Fracture of thyroid cailage, C. Staining of saliva, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Staining of saliva', 'role': 'assistant'}]