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
Electric pulp tests may not be performed on patients who have: 
Select and explain. 
A. Hip implant, B. Pace maker, C. Dental implant, D. Prosthetic eye
B: Pace maker
Answer: B: Pace maker 
Explanation: None