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': 'M/c cause of chronic laryngeal stenosis ? \nSelect and explain. \nA. Trauma, B. TB, C. Wegeners, D. Tumor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Trauma Laryngeal stenosis (LS) is a congenital or acquired narrowing of the larynx causing airway compromise. The acquired causes may be due to endotracheal intubation, trauma, burns, inflammation, neoplasms, autoimmune disorders and collagen vascular disease.", 'role': 'assistant'}]