This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Which of the following is a homopolysaccharide? 
Select and explain. 
A. Heparin, B. Chitin, C. Chondroitin sulphate, D. Hyaluronic acid
B: Chitin
Answer: B: Chitin 
Explanation: Chitin is composed of n-acetyl D-glucosamine held together by beta glycosidic bonds Heparin,chondroitin sulfate,hyaluronic acid are heteropolysacharides. Heparin - composed of D-glucuronate 2-sulfate,n-sulfoglucosamine 6-sulfate Chondritin sulfate-composed of D-glucuronic acid,N-acetylgalactosamine 4-sulfate Hyaluronic acid-D-glucuronic acif,N-acetylglucosamine Ref : satyanarayana ,4th edition pg no: 22