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: Medicine
[{'content': "The term' end stage renal disease (ESRD)' is considered appropriate when GFR falls to- \nSelect and explain. \nA. 50% of normal, B. 25% of normal, C. 10 - 25% of normal, D. 5 - 10% of normal", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]