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
Reduction in severity of gingivitis occurs by which month? 
Select and explain. 
A. 2 month of pregnancy, B. 2 month postpartum, C. 3 month postpartum, D. 3 month postpartum pregnancy
B: 2 month postpartum
Answer: B: 2 month postpartum 
Explanation: 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