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': 'PAH is used to measure? \nSelect and explain. \nA. Extracellular fluid, B. Glomerular filtration rate, C. Renal plasma flow, D. Plasma value', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is'c'i.e., Renal plasma flow [Rel Ganong 248/e p, 678-679)A substance which closely satisfies this description is para-aminohippuric acid (PAH), Therefore,PAH is used to measure renal plasma flow.The PAH clearance ln a normal adult lc about 625 mV minute. That's a measure of effective renal plasma flow (ERPF).PAH is only 90% excreted in the urine in a single passage through the kidney, i.e., its extraction ratio is 0.9 (90%).", 'role': 'assistant'}]