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': 'NaF preservative is added in suspected cases of poisoning by ? \nSelect and explain. \nA. Cocaine, B. Alcohol, C. Cyanide, D. All the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Alcohol", 'role': 'assistant'}]