This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
Which of the following laser is most commonly used in laryngeal surgery 
Select and explain. 
A. CO2 Laser, B. Nd YAG laser, C. Argon Laser, D. KTP Laser
A: CO2 Laser
Answer: A: CO2 Laser 
Explanation: Treatment consists of: 1. Radiotherapy 2. Surgery (a) Conservation laryngeal surgery (b) Total laryngectomy 3. Combined therapy. Surgery with pre- or postoperative radiotherapy 4. Endoscopic CO2 laser excision Ref: PL Dhingra; Textbook of EAR, NOSE and THROAT; edition 7; page no 351