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
Functioning of a pace maker can be affected by which of the following? 
Select and explain. 
A. Piezoelectric ultrasonic scaler, B. Magnetostrictive ultrasonic scaler, C. Sonic scalers, D. All the above
B: Magnetostrictive ultrasonic scaler
Answer: B: Magnetostrictive ultrasonic scaler 
Explanation: None