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': 'The monsaccharide glucose is best described by which one of the following  statements? \nSelect and explain. \nA. It usually exists in the furanose form, B. It is a ketose, C. It possesses an anomeric C-2 carbon atom, D. It forms part of the disaccharide sucrose', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Two monosaccharide units are linked by a glycosidic\xa0bond or yield 2 monosaccharide units on hydrolysis.\xa0Depending on their reducing property, they are divided\xa0into:\n\nNonreducing disaccharides: The functional groups are\xa0involved in the glycosidic bond formation, hence free\xa0functional groups are not available\nReducing disaccharides: Free functional groups are\xa0available.\n\nKey Concept:\n\nGlucose forms part of sucrose and is attached to fructose to form disaccharide i.e.,sucrose.', 'role': 'assistant'}]