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A 50-year-old female patient has an FEV1 of 1.8 liters and an FVC of 3.2 liters. What is the patient's
FEV1/FVC ratio, and what does it suggest about the patient's lung function?
0.39, severe obstruction
O 0.56, moderate obstruction
0.69, mild obstruction
O 0.78, normal lung function

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