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 O 0.69, mild obstruction O 0.78, normal lung function
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