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': 'The confirmatory test for pulp vitality is \nSelect and explain. \nA. Thermal test, B. Test cavity, C. Analytical technology electrical pulp tester, D. Digital pulp videography', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]