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
Laser used in laryngeal work is 
Select and explain. 
A. Argon, B. Nd:Yag, C. Holmium, D. CO2
D: CO2
Answer: D: CO2 
Explanation: CO2 laser:- CO2 laser is used in laryngeal surgery to excise vocal nodules, polyps, cysts, granulomas or juvenile laryngeal papilloma. Also used in case of leukoplakia, T1 lesion of vocal cord or localized leisions of supraepiglottis and infraglottis. 1) CO2 laser has wavelength 10,400nm 2) It can cut pericisely (0.3 mm percision), coagulate bleeders and vaporise tissues 3) Besides laryngeal surgery it is used in oropharyngeal surgery to excise benign or malignant lesions and in plastic surgery. Ref:- Dhingra; pg num:-357