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
Testing sequence for pulp testing should be: 
Select and explain. 
A. Posterior to midline., B. Midline to posterior., C. Posterior to involved tooth., D. Any of the above.
A: Posterior to midline.
Answer: A: Posterior to midline. 
Explanation: None