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': 'Specimens of toxicological studies is preserved in- \nSelect and explain. \nA. 10% of formaldehyde, B. Alcohol, C. Supersaturated solution of common salt, D. Normal saline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most common preservative for toxicological specimen is saturated solution of sodium chloride (NaCl).', 'role': 'assistant'}]