75) ANSWER

B) "Cromolyn limits inflammation, and therefore bronchoconstriction, with exposure to an allergen."

RATIONALE

Cromolyn is a nonsteroidal agent that stabilizes mast cells so bronchoconstrictive and inflammatory substances are not released when stimulated with an allergen. It is used to treat inflammation of the airway. It does not cause bronchoconstriction (option 4), and is not a bronchodilator (option 1) or expectorant (option 3). Use medication knowledge and the process of elimination to make a selection.