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
YAG laser wave is: March 2004 
Select and explain. 
A. Colorless, B. Red, C. Green, D. Blue
A: Colorless
Answer: A: Colorless 
Explanation: Ans. A i.e. Colorless