A 50-year-old woman presents to the clinic with a persistent cough and sputum production for the past three months. She reports a history of smoking for 15 years. On examination, there are coarse crackles heard on auscultation, particularly in the lower lung fields. The patient denies any history of wheezing or shortness of breath.

A. Asthma: Typically presents with reversible wheezing and shortness of breath, not chronic cough with sputum. B. Pneumonia: Presents with acute onset, fever, chills, productive cough; not a gradual 3-month history. C. Chronic bronchitis: Defined by productive cough for at least 3 months in 2 consecutive years; fits this smoker’s presentation. D. Emphysema: More commonly causes dyspnea and barrel chest due to alveolar destruction, not chronic cough with sputum.