This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Chitin is a: \nSelect and explain. \nA. Polypeptide, B. Fatty ester, C. Polysacchride, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chitin is a long-chain polymer of a N-acetylglucosamine/ structural polysacchride, a derivative of glucose, and is found in many places throughout the natural world.It is the main component of the cell walls of fungi, the exoskeletons of ahropods such as crustaceans (e.g. crabs, lobsters and shrimps) and insects, the radulas of mollusks and the beaks of cephalopods, including squid and octopi. Chitin may be compared to the polysaccharide cellulose and to the protein keratin.', 'role': 'assistant'}]