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': 'A high-risk dental caries individual is on\tpreventive\nschedule, the sugar exposure should be: \nSelect and explain. \nA. Reduced to meal times, B. Reduced to no exposure permanently, C. Reduced to no exposure for 21 days, D. Reduced to meal time exposure for 21 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]