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
C.S.F. is required to be preserved in - 
Select and explain. 
A. Alcoholic poisoning, B. Arsenic poisoning, C. Copper poisoning, D. Organophosphorus poisoning
A: Alcoholic poisoning
Answer: A: Alcoholic poisoning 
Explanation: For alcohol poisoning, blood, CSF, vitreous humor and urine are preserved with using fluoride as a preservative.