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': 'Following death of a person, what happens to potassium level in the vitreous. \nSelect and explain. \nA. Potassium level falls, B. Potassium level increases, C. Remains unchanged, D. It depends on cause of death', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Potassium concentration raises at the rate of 0.17-0.25 mmol per hour following death. It\xa0helps in determination of time since death.', 'role': 'assistant'}]