A 58-year-old retired underground coal miner with 32 years of exposure and a 40 pack-year smoking history presents with progressive dyspnea and productive cough with black-tinged sputum. Chest X-ray shows bilateral upper lobe conglomerate masses exceeding 10 cm with upper zone predominance, consistent with progressive massive fibrosis (PMF) from complicated coal worker pneumoconiosis. Pulmonary function testing reveals FVC 58% predicted, FEV1 42% predicted, FEV1/FVC ratio 0.58, TLC 78% predicted, RV 145% predicted, and DLCO 38% predicted with no bronchodilator response. The spirometric pattern marked **A** in the diagram best represents this patient's pulmonary physiology. Which of the following clinical scenarios would be MOST CONSISTENT with the pattern shown at **A**?
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