A chronic pulmonary disease in which it is difficult to exhale air from the lungs is called:
A) croup.
B) emphysema.
C) empyema.
D) epistaxis.
B
Explanation: A) Croup is an acute childhood respiratory disease.
B) Correct.
C) Empyema is a collection of pus in the pleural cavity.
D) Epistaxis is a nosebleed.
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