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': 'Percussion,palpation,and thermal testing \nSelect and explain. \nA. are not to be  performed on patients with pacemakers., B. should involve testing  of contralateral  teeth for comparison., C. are  best compared when using ipsilateral teeth., D. obviate radiographs.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]