This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glomerular Filtration, Renal Blood Flow, and Their Control, Subject name: Physiology
[{'content': 'Two substances that can probably be used to determine filtration fraction are - \nSelect and explain. \nA. Insulin and mannitol, B. Urea anddiodrast, C. PAH and phenol red, D. Inulin and PAH', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Inulin and PAH o GFR is measured by inulin and renal plasma flow is measured by PAH.", 'role': 'assistant'}]