Problem: The patient is a 70-year-old male with a 104-pack year smoking history presents to the emergency department in severe respiratory distress with significant hyperventilation. On physical examination, he is noted to have pursed-lip breathing, cyanosis of his lips, finger clubbing, and a "barrel-chest" appearance. The patient is being treated with a nebulizer breathing treatment and steroids. Pathologic findings would most likely reveal alveolar structure destruction, enlargement of the alveolar airspaces, loss of lung tissue elasticity with no obvious fibrosis. Based on the given information, which of the following is most likely the patient's diagnosis? Group of answer choices emphysema chronic bronchitis chronic obstructive pulmonary disease pulmonary fibrosis acute respiratory distress syndrome