This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 1, Subject name: Forensic Medicine
[{'content': 'Which is a better preservative for urine in viscera packing \nSelect and explain. \nA. Concentrated Hydrochloric acid, B. Thymol, C. Toluene, D. Sodium fluoride', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Concentrated Hydrochloric acid, Thymol, Toluene, Sodium fluoride used to preserve urine - Of which, Toluene is better.', 'role': 'assistant'}]