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': 'In treating a case with rampant caries: \nSelect and explain. \nA. Restrict intake of sweets only, B. Allow no sugar for 21 days, C. Allow no sugar for 7 days, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]