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
NaF preservative is added in suspected cases of poisoning by ? 
Select and explain. 
A. Cocaine, B. Alcohol, C. Cyanide, D. All the above
B: Alcohol
Answer: B: Alcohol 
Explanation: Ans. is 'b' i.e., Alcohol