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
CSF sample is preserved for which poisoning: FMGE 10 
Select and explain. 
A. Heavy metal, B. Alphos, C. Organophosphates, D. Alcohol
D: Alcohol
Answer: D: Alcohol 
Explanation: Ans. Alcohol