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': 'Electric pulp tests may not be performed on patients who have: \nSelect and explain. \nA. Hip implant, B. Pace maker, C. Dental implant, D. Prosthetic eye', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]