Which of the following physical examination test results is considered a hallmark of asthma?
A) Reduction in forced expiratory volume in the first second (FEV₁) .
B) FEV₁/FVC ratio is low.
C) Maximum mid-expiratory flows (25% to 75% of FVC) is reduced.
D) Improvement in FEV₁ >12% after bronchodilator administration.
Correct Answer:
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