This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'A 49-year-old man suffering from depression attempts suicide by jumping out of the window of his third-floor apartment. He requires multiple operations during a prolonged, complicated hospital stay. Endotracheal intubation is attempted in the ICU but is unsuccessful because of tracheal stenosis, which is attributed to which of the following? \nSelect and explain. \nA. Prolonged nasotracheal intubation, B. Orotracheal intubation, C. Tracheostomy tubes, D. High oxygen delivery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Any object that compromises the blood supply to the tracheal mucosa or cartilage can cause stenosis. When the mean intramural pressure exceeds 20-30 mm Hg over a prolonged period, damage occurs.', 'role': 'assistant'}]