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': 'YAG laser wave is: March 2004 \nSelect and explain. \nA. Colorless, B. Red, C. Green, D. Blue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Colorless', 'role': 'assistant'}]