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
When the dental plaque is allowed to accumulate in the absence of any plaque control procedures, it results in gingivitis within 
Select and explain. 
A. 1 to 3 days, B. 7 to 21 days, C. 2 months to 3 months, D. 24 hours to 48 hours
B: 7 to 21 days
Answer: B: 7 to 21 days 
Explanation: None