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': 'All the following is true about Kevorkian sign except. \nSelect and explain. \nA. Persist even after 3 years of death, B. Appear within minutes of death, C. Visualized using opthalmoscope, D. Cattle tracking sign', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Kevorkian sign / cattle tracking sign\n\nIt is the earliest change in eye after death.\nBlood in the retinal vessels appear fragmented, visualized in opthalmoscope.\nIt apppears with in few seconds to minutes after death and persists for an hour.', 'role': 'assistant'}]