Which condition is described as a chronic lung disease most commonly caused by smoking?

• A. Hypertension
• B. Diabetes Mellitus
• C. COPD
• D. Myocardial Infarction

Answer: (C)

Chronic obstructive pulmonary disease is a long-term lung condition where airflow is gradually limited and worsens over time. It is most commonly caused by smoking, which irritates and damages the airways and lung tissue, leading to components like chronic bronchitis and emphysema. People with COPD typically experience ongoing breathlessness, a persistent cough, and trouble with daily activities, and the airflow limitation is not fully reversible. The other options describe conditions outside of a chronic lung disease: hypertension is high blood pressure, diabetes mellitus is a metabolic disorder, and myocardial infarction is a heart attack. So COPD best fits the description.