<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 71-year-old man is admitted to the ICU with a history of severe pancreatitis and new onset difficulty breathing. His vital signs are a blood pressure of 10060 mm Hg, heart rate of 100min, respirations of 27min, temperature of 36.7C 98.1F, and oxygen saturation of 85 on room air. Physical examination shows a cachectic male in severe respiratory distress. Rales are heard at the base of each lung. The patient is intubated and a Swan-Ganz catheter is inserted. Pulmonary capillary wedge pressure is 8 mm Hg. An arterial blood gas study reveals a PaO2: FiO2 ratio of 180. The patient is diagnosed with acute respiratory distress syndrome. In which of the following segments of the respiratory tract are the cells responsible for the symptoms observed in this patient found?? A: Respiratory bronchioles, B: Terminal bronchioles, C: Bronchioles, D: Alveolar sacs, E: Bronchi,  <response>: This is a medical question asking about the location of cells responsible for symptoms of acute respiratory distress syndrome ARDS in a 71-year-old man admitted to the ICU. The key information in the stem is that the patient has a history of severe pancreatitis, new onset breathing difficulty, low oxygen saturation, rales in the lung bases, and a diagnosis of ARDS based on low PaO2:FiO2 ratio. The question asks in which segment of the respiratory tract are the cells responsible for the ARDS symptoms found. To answer this, I need to know which cells and respiratory structures are involved in gas exchange and can be damaged in ARDS.D: Alveolar sacs 