Final answer:
The drug that could be used to treat asthma by opening airways wider is a beta agonist. Out of the given options, Zafirlucast is NOT a beta agonist.
Step-by-step explanation:
The drug that could be used to treat asthma by opening airways wider is a beta agonist. Beta agonists are a type of medication that stimulate the beta receptors in the airway smooth muscles, causing them to relax and dilate the airways. This helps to relieve the symptoms of asthma, such as wheezing and shortness of breath.
Out of the given options, Zafirlucast is NOT a beta agonist. Zafirlucast is a leukotriene receptor antagonist that works by blocking the action of certain chemicals in the body that cause inflammation and narrowing of the airways. It is used as an alternative treatment for asthma, but it does not directly open the airways wider like beta agonists do.