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': 'In burnt bones, the following can be detected : \nSelect and explain. \nA. Arsenic, B. Lead, C. Organophosphorus compound, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Arsenic', 'role': 'assistant'}]