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': 'Viscera should be preserved if the cause of death is suspected. All of the following does not require preservatives, EXCEPT: \nSelect and explain. \nA. Nail, B. Hair, C. Bone, D. Brain', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Preservatives are not necessary if, Viscera can be analyzed within 24 hours If sample can be kept in a refrigerator or ice box Bone, hair, nails Lung for detecting inhaled poisons Ref: The Essentials of Forensic Medicine and Toxicology by Dr. K. S. Narayan Reddy, 27th edition, Page 111.', 'role': 'assistant'}]