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
[{'content': 'In Irodotomy LASER used is: \nSelect and explain. \nA. Nd:YAG, B. CO2, C. Argon, D. Diode', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CO2', 'role': 'assistant'}]