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': 'Best test for GFR is with: \nSelect and explain. \nA. Inulin, B. Hippuric acid, C. Creatinine, D. PAH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Inulin (Measurement of GFRGFR can be measured by measuring the excretion & plasma level of a substance that is freely filtered through glomeruli and neither secreted not reabsorbed by the tubulesQ.Requirement of substances used to measure GFR- Substances used- Filtered freely- Inulin (standard)Q- Neither reabsorbed, nor secreted by tubules- Creatinine- Nontoxic - Not metabolized by body.', 'role': 'assistant'}]