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 commonly used laser for curing composite resin is \nSelect and explain. \nA. Nd:YAG, B. CO2, C. ER:YAG, D. Argon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]