This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
[{'content': 'A 29-year-old woman presents with increasing shortness of breath and coughing. She had asthma as a child but has not required any treatment for the past 10 years. On examination, she has expiratory wheezes. Which of the above may cause bronchodilation?For the above patient with a clinical symptom, select the most appropriate medication. \nSelect and explain. \nA. albuterol, B. ethanol, C. amitriptyline, D. NSAIDs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ephedrine, isoproterenol, and albuterol are beta-adrenergic agonists and cause bronchodilatation. Ipratropium bromide also results in bronchodilatation by its anticholinergic effect. In susceptible individuals, the beta2-adrenergic blocking effect of propranolol can cause life-threatening bronchoconstriction. The other medications listed have no effect on bronchial airways.', 'role': 'assistant'}]