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': 'Putrefaction is retarded by: \nSelect and explain. \nA. Lead, B. Mercury, C. Arsenic, D. Copper', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Arsenic', 'role': 'assistant'}]