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': 'For toxicological analysis, viscera are preserved in- \nSelect and explain. \nA. 20% alcohol, B. 10% formalin, C. 10% sodium chloride, D. Common bile salt', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Actually, 10% sodium chloride is not a fully correct answer. Toxicological viscera is preserved in a saturated solution of common salt (sodium chloride). But this happens to be the closest answer.\nFor toxicological analysis, viscera is never preserved in alcohol, formalin, or bile salt. In fact, formalin denatures proteins and chemical toxins and would interfere with the detection of poisons during chemical analysis.', 'role': 'assistant'}]