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
[{'content': 'CSF sample is preserved for which poisoning: FMGE 10 \nSelect and explain. \nA. Heavy metal, B. Alphos, C. Organophosphates, D. Alcohol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Alcohol', 'role': 'assistant'}]