This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
Preservation of brain is not required in - 
Select and explain. 
A. Alkaloid poisoning, B. Organophosphorus poisoning, C. Volatile organic poisoning, D. Heavy metal poisoning
D: Heavy metal poisoning
Answer: D: Heavy metal poisoning 
Explanation: Brain need not be preserved in heavy metal poisoning as it is not seen in brain tissue. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 62.