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': 'The time duration taken for the periodontal fibers to realign themselves after orthodontic treatment is \nSelect and explain. \nA. 28 days, B. 90 days, C. 120 days, D. 280 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]