A 52-year-old man presents with a 3-month history of episodic chest tightness and shortness of breath at night. Spirometry shows FEV1/FVC of 0.85 and a 15% improvement in FEV1 after bronchodilator. What is the most likely diagnosis?
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A
Asthma
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B
COPD
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C
Cardiac asthma
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D
Vocal cord dysfunction