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 of the following is used for treatment of myopia: \nSelect and explain. \nA. Nd: YAG laser, B. Excimer laser, C. Argon laser, D. Holmium laser', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Excimer laser', 'role': 'assistant'}]