This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification of carbohydrate, Subject name: Biochemistry
Inulin is a: 
Select and explain. 
A. Glucosan, B. Fructosan, C. Galactosan, D. Mannosan
B: Fructosan
Answer: B: Fructosan 
Explanation: 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