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': 'It is true about formalin : \nSelect and explain. \nA. That it can be used as preservative in alcohol poisoning, B. Never used as a preservative for chemical analysis, C. Used as a preservative in poisoning with digitals, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Never used as a preservative for chemical analysis', 'role': 'assistant'}]