Theophylline produces which of the following?

Question

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Theophylline produces an antiinflammatory effect through inhibition of cAMP-specific phosphodiesterase enzymes in proinflammatory cells and tissues.Although the mechanism by which it is achieved is unknown,theophylline has been shown to produce an increase in the force of respiratory muscle contractility and respiratory muscle endurance.Theophylline has not been shown to cause an increase in pulmonary vascular resistance.Methylxanthines as a whole have shown an ability to increase ventilatory drive.More specifically,theophylline can increase phrenic nerve activity for a given level of chemical stimulus.

Theophylline Produces Which of the Following? A)Increased β\betaβ 2 Stimulation Causing Bronchodilation B)Increased Respiratory Muscle Strength and Endurance

Theophylline Produces Which of the Following?
A)Increased $\beta$ ₂ Stimulation Causing Bronchodilation
B)Increased Respiratory Muscle Strength and Endurance