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': 'Meyer cotton Grading system used for \nSelect and explain. \nA. Laryngocoele, B. Subglottic stenosis, C. Laryngomolocia, D. TB larynx', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]