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: Physiology
[{'content': 'Oxygen Hb dissociation curve: Inulin clearance closely resembles: \nSelect and explain. \nA. GFR, B. Renal plasma flow, C. Creatinine clearance, D. PAH clearance', 'role': 'user'}, {'content': 'Answer: A \nExplanation: GFR', 'role': 'assistant'}]