This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
[{'content': 'Starch is a: \nSelect and explain. \nA. Polysaccharide, B. Disaccharide, C. Protein, D. None of these', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. PolysaccharideStarch is a homo polysaccharide composed of D- glucose units held together by a-glycosidic bonds, (a 1-- 4 linkages; at branching points a 1 -- 6 linkages). It is also known as a glucosan. Hydrolyzed by enzyme amylase. It has two forms: a- amylase present in saliva and pancreatic juice. b-amylase present in sprouted grains and malts.', 'role': 'assistant'}]