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: Ophthalmology
In Irodotomy LASER used is: 
Select and explain. 
A. Nd:YAG, B. CO2, C. Argon, D. Diode
B: CO2
Answer: B: CO2 
Explanation: CO2