Select the mechanism of action of the bronchodilator drug theophylline.
A) Theophylline antagonizes adenosine, a bronchoconstrictor.
B) Theophylline inhibits the enzyme phosphodiesterase (PDE) , which slows the metabolism of cAMP.
C) Theophylline inhibits the enzyme phosphodiesterase (PDE) , which slows the inactivation of cAMP.
D) All of these are correct.
Correct Answer:
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