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
Urine is stored in - 
Select and explain. 
A. Formaldehyde, B. Normal saline, C. Hydrochloric acid, D. Thymol
D: Thymol
Answer: D: Thymol 
Explanation: Toluene is the best preservative of urine for chemical analysis and Thymol for general purpose.