Problem: The nurse is having a health teaching session the community. Which of the following information about emphysema is correct? A. Emphysema is characterized by the presence of over distended and non-functional alveoli. B. Emphysema is characterized by inflammation and increase production of mucus causing narrowing of airway. C. Emphysema is characterized by a productive cough that lasts 3 months in each of 2 consecutive years, in a patient in whom other causes of cough are excluded. D. Emphysema is a form of acute respiratory failure that occurs as a complication of some other condition; it is caused by a diffuse lung injury and leads to extravascular lung fluid.