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': 'From vitreous humor, estimation of time since death is done by: WB 11; NEET 13 \nSelect and explain. \nA. K+- level, B. Na+ level, C. Glucose level, D. Urea level', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. K+- level', 'role': 'assistant'}]