COPD is described as which of the following?

• A. A reversible airway obstruction
• B. A viral lung infection
• C. A kidney disease
• D. A permanent, destructive pulmonary disorder that is a combination of chronic bronchitis and emphysema

Answer: (D)

COPD is a permanent, destructive lung condition with irreversible airflow limitation that results from long-term damage in the airways and air sacs, specifically the combination of chronic bronchitis and emphysema. Chronic bronchitis produces a productive cough for many months over years, while emphysema damages the walls of the air sacs, reducing surface area for gas exchange. This combination makes the airflow limitation progressive and not fully reversible with treatment, which is why the description fits COPD best.

A reversible airway obstruction would describe conditions like asthma, where airflow obstruction can improve with treatment. A viral lung infection is typically acute, not a chronic, lasting disorder. A kidney disease involves a different organ system altogether.