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': 'Laser pulpotomy uses: \nSelect and explain. \nA. Nd:YAG laser, B. Er:YAG laser., C. Co2, D. Cr:YSGG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nd: YAG laser has 100% success rate.', 'role': 'assistant'}]