Answer:
Option (D).
Step-by-step explanation:
COPD ( chronic obstructive pulmonary disorder) may be defined as the medical condition to denote the large number of progressive lung diseases. The diseases included chronic bronchitis, asthma and emphysema.
Agonist increases the effect of drug in presence of the other chemical molecule. Exacerbation can be prevented by using glucocorticoid as prophylaxis.
Thus, the correct answer is option (D).