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: ENT
[{'content': 'Which of the following lasers is most commonly used in Laryngeal surgery - \nSelect and explain. \nA. CO2 laser, B. Nd YAG laser, C. Argon laser, D. KTP laser', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]