This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medicolegal Autopsy, Subject name: Forensic Medicine
[{'content': 'Sodium Fluride is used for preservation of- \nSelect and explain. \nA. Urine, B. Blood, C. Alcohol, D. Carbolic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans- B B>A.', 'role': 'assistant'}]