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
[{'content': 'Functioning of a pace maker can be affected by which of the following? \nSelect and explain. \nA. Piezoelectric ultrasonic scaler, B. Magnetostrictive ultrasonic scaler, C. Sonic scalers, D. All the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]