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
Incidence of Gingivitis in pregnency is 
Select and explain. 
A. 10-20%, B. 20-30%, C. 40-50%, D. 50-100%
D: 50-100%
Answer: D: 50-100% 
Explanation: None