This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
Which of the following product is primarily filtered with little secretion or reabsorption in renal tubules? 
Select and explain. 
A. Sodium, B. Inulin, C. Glucose, D. Amino acids
B: Inulin
Answer: B: Inulin 
Explanation: In addition to the requirement that it be freely filtered and neither reabsorbed nor secreted in the tubules, a substance suitable for measuring the GFR should be nontoxic and not metabolized by the body. Inulin, a polymer of fructose with a molecular weight of 5200 that is found in Jerusalem aichokes (Helianthus tuberosus), meets these criteria in humans and most animals and is extensively used to measure GFR.Ref: Ganong's review of Medical Physiology, 23rd edition, Page no: 645