Which of the Following Pulmonary Function Values Characterizes an Obstructive

Which of the following pulmonary function values characterizes an obstructive lung disorder?
I. The forced vital capacity (FVC) is normal or decreased.
II. The forced expiratory volume in 1 second (FEV₁) is decreased.
III. The ratio of residual volume to total lung capacity (RV/TLC) is decreased.
IV. RV is increased.

A) II and IV only
B) I and III only
C) I, II, and IV only
D) II, III, and IV only

Correct Answer:

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