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': 'Testing sequence for pulp testing should be: \nSelect and explain. \nA. Posterior to midline., B. Midline to posterior., C. Posterior to involved tooth., D. Any of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]