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
After cleaning and pumicing the tooth surface, plaque formation takes place within 
Select and explain. 
A. A few minutes, B. 1/2 to 1 hour, C. 2 to 4 hour, D. After 1 hour
B: 1/2 to 1 hour
Answer: B: 1/2 to 1 hour 
Explanation: None