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
The confirmatory test for pulp vitality is 
Select and explain. 
A. Thermal test, B. Test cavity, C. Analytical technology electrical pulp tester, D. Digital pulp videography
B: Test cavity
Answer: B: Test cavity 
Explanation: None