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
Which type of laser is preferred for creating an iridotomy ? 
Select and explain. 
A. Nd Yag laser, B. CO2 laser, C. Argon laser, D. Diode laser
A: Nd Yag laser
Answer: A: Nd Yag laser 
Explanation: Q-switched Nd:YAG laser, the argon laser and diode lasers can be effectively used fc: iridotomy. Nd: YAG laser has become the preferred method for creating an iridotomy.