Which of the following product is primarily filtered with little secretion or reabsorption in renal tubules?

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