<prompt> Inulin is a:GlucosanFructosanGalactosanMannosan  <response>: Glucosan Glucan - polymer of glucose e.g. Cellulose Fructosan Fructan - polymer of fructose e.g. Inulin Inulin homopolysaccharide of fructose. Source - garlic, onion neither absorbed nor secreted by renal tubules. Inulin clearance - Ideal for measuring Glomerular Filtration Rate GFR but it is not used widely as it has to be exogenously given to patient. Use : As a prebiotic 