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': 'A person was found dead with bluish green frothy discharge at the angle of mouth and nostrils. Probable cause can be: AIIMS 12 \nSelect and explain. \nA. Arsenic poisoning, B. Copper poisoning, C. Mercury poisoning, D. Lead poisoning', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Copper poisoning', 'role': 'assistant'}]