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
The commonly used laser for curing composite resin is 
Select and explain. 
A. Nd:YAG, B. CO2, C. ER:YAG, D. Argon
D: Argon
Answer: D: Argon 
Explanation: None