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
Ultrasonic scalers vibrate at approximately 
Select and explain. 
A. 25000 cycles per second, B. 15000 cycles per second, C. 10000 cycles per second, D. 50000 cycles per second
A: 25000 cycles per second
Answer: A: 25000 cycles per second 
Explanation: None