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': "Widmark's formula is used to calculate the quantity of the following in the body after equilibrium between the blood and tissue is reached: \nSelect and explain. \nA. Methyl alcohol, B. Nitrous oxide, C. Ethyl alcohol, D. Lithium carbonate", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Ethyl alcohol', 'role': 'assistant'}]