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': 'The average fatal period of copper poisoning is - \nSelect and explain. \nA. 30-60 minutes, B. 1-3 days, C. 3-7 days, D. 7-14 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fatal period with copper salts is 1-3 days.', 'role': 'assistant'}]