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