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
Meyer cotton Grading system used for 
Select and explain. 
A. Laryngocoele, B. Subglottic stenosis, C. Laryngomolocia, D. TB larynx
B: Subglottic stenosis
Answer: B: Subglottic stenosis 
Explanation: None