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
Preservative used for toxicological specimen - 
Select and explain. 
A. 20% formalin, B. Saturated sodium chloride, C. 20% alcohol, D. 10% alcohol
B: Saturated sodium chloride
Answer: B: Saturated sodium chloride 
Explanation: Saturated salt solution → All poisons including carbolic acid, but excluding other acids.
Rectified spirit → Poisoning with all acids except carbolic acid.