This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thanatology, Subject name: Forensic Medicine
[{'content': 'Which of the following is not used as a preservative in chemical analysis:- \nSelect and explain. \nA. Glycerine, B. Formalin, C. Rectified spirit, D. Salt solution', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Formalin is not used as preservative in chemical analysis because it can destroy poison from tissue. It is only used as preservative in histopathological examination. Rectified spirit is the best preservative for chemical analysis. Salt solution and Glycerine are also commonly used.', 'role': 'assistant'}]