This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'What is the GFR (mL/min per 1.73m2) of a patient who is in stage IV of chronic kidney disease? \nSelect and explain. \nA. 60 - 89, B. 30 - 59, C. 15 - 29, D. < 15', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]