This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 3, Subject name: Forensic Medicine
[{'content': 'The preservative of choice in this poisoning: \nSelect and explain. \nA. Rectified spirit, B. Saturated solution of sodium chloride, C. Formalin, D. Sodium flouride', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The most commonly used preservative for viscera is saturated solution of common salt (NaCl) because It is easily available, cheap and effective preservative. However, the best preservative for preservation of viscera is rectified spirit. z In cases of suspected alkali or acid poisoning (except carbolic acid), only rectified spirit is used.', 'role': 'assistant'}]