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
In cyanide poisoning, the specimen of blood must be covered with what to avoid evaporation 
Select and explain. 
A. Saturated salt solution, B. Formalin, C. Liquid paraffin, D. Acetone
C: Liquid paraffin
Answer: C: Liquid paraffin 
Explanation: - In cyanide poisoning, the specimen of blood must be covered with liquid paraffin to avoid evaporation. CYANIDE POISONING : - ideal suicidal poison, - Cyanide inhibits cytochrome oxidase (ETC) - Histotoxic anoxia - Managed with Lilly's antidote Vitamin B12 Dicobalt EDTA