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': 'Ratio between blood ethyl alcohol to urine ethyl alcohol concentration is: \nSelect and explain. \nA. 2:01, B. 2:03, C. 01:01.3, D. 03:03.3', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Urine has about 25% more water than an equal volume of blood, so its concentration of alcohol would be about 25% higher than in blood collected at the same time. In order to compare the blood and urine, a ratio of 1:1.33 is used when urine and blood are in equilibrium. Ref: The Essentials of Forensic Medicine and Toxicology by Narayan Reddy, 27th edition, Page 506.', 'role': 'assistant'}]