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': 'Reduction in severity of gingivitis occurs by which month? \nSelect and explain. \nA. 2 month of pregnancy, B. 2 month postpartum, C. 3 month postpartum, D. 3 month postpartum pregnancy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Partial reduction in the severity of gingivitis occurs by 2 months postpartum, and after 1 year the condition of the gingival is comparable to that of patients who have not been pregnant', 'role': 'assistant'}]