What does COPD stand for?

Chronic Obstructive Pulmonary Disease (COPD) is a progressive lung disease characterized by increasing breathlessness. The term defines a group of diseases that cause airflow blockage and breathing-related problems, primarily including emphysema and chronic bronchitis. The correct interpretation of COPD reflects its chronic nature, indicating a long-term condition that obstructs airflow, leading to significant respiratory issues.

The phrase "Chronic Obstructive" signifies that the obstruction is enduring and often results from long-standing exposure to irritating gases or particulate matter, most commonly from cigarette smoke. "Pulmonary Disease" refers to any condition affecting the lungs that also encompasses both the obstruction of airflow and other pulmonary complications. This definition aligns accurately with medical literature and clinical practices surrounding respiratory health.

In contrast to the other options, their formulations either misunderstand terms related to pulmonary conditions or inaccurately describe COPD. The correct answer—A—accurately captures the full meaning of the acronym as utilized in medical diagnostics and treatment protocols.