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': 'Xylitol is \nSelect and explain. \nA. Caloric sweetener, B. Non caloric sweetener, C. Low caloric artificial sweetener, D. Low caloric natural sweetener', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]