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
The optimal flow rate of coolant for sonic and ultrasonic subgingival scaling is 
Select and explain. 
A. 1-11 ml/min, B. 14-23 ml/min, C. 24-32 ml/min, D. 34-40 ml/min
B: 14-23 ml/min
Answer: B: 14-23 ml/min 
Explanation: None