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: Dental
[{'content': 'Sorbitol acts in the prevention of dental caries by \nSelect and explain. \nA. Microorganisms Lack the enzyme to metabolize sorbitol, B. Lactic acid can not be produced, C. Fermentation of sorbitol does not occur, D. sorbitol is not a carbohydrate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]