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': 'Which type of laser is preferred for creating an iridotomy ? \nSelect and explain. \nA. Nd Yag laser, B. CO2 laser, C. Argon laser, D. Diode laser', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]