A 55-year-old smoker presents with progressive dyspnea and a barrel chest. Spirometry shows FEV1/FVC ratio of 0.60 and FEV1 40% predicted. Which GOLD stage does this represent?
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A
GOLD 1 (Mild)
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B
GOLD 2 (Moderate)
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C
GOLD 3 (Severe)
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D
GOLD 4 (Very Severe)