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
Which is a better preservative for urine in viscera packing 
Select and explain. 
A. Concentrated Hydrochloric acid, B. Thymol, C. Toluene, D. Sodium fluoride
C: Toluene
Answer: C: Toluene 
Explanation: - Concentrated Hydrochloric acid, Thymol, Toluene, Sodium fluoride used to preserve urine - Of which, Toluene is better.