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 type of laser used in pulpotomy procedure is \nSelect and explain. \nA. Nd :YAG Laser, B. Carbon dioxide laser, C. Argon Laser, D. Er:YAG laser', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]