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
Brain is preserved in all of the following, except: AIIMS 06 
Select and explain. 
A. OPC poisoning, B. Alkaloid poisoning, C. Heavy metal poisoning, D. Volatile organic poisoning
C: Heavy metal poisoning
Answer: C: Heavy metal poisoning 
Explanation: Ans. Heavy metal poisoning