question: Q:A 5-year-old boy is brought to his pediatrician's office by his parents for a scheduled visit. His father tells the physician that he has observed, on several occasions, that his son has difficulty breathing. This is more prominent when he is outside playing with his friends. These symptoms are increased during the spring and winter seasons, and, of late, the boy has one such episode almost every week. During these episodes, he usually wheezes, coughs, and seems to be winded as if something was restricting his ability to breathe. These symptoms have not affected his sleep at night. This breathlessness does not limit his daily activities, and whenever he does have an episode it subsides after he gets some rest. He does not have any other pertinent medical history and is not on any medication. His physical examination does not reveal any significant findings. The pediatrician checks his expiratory flow rate in the office and estimates it to be around 85% after conducting it three times. Which of the following drugs is the pediatrician most likely to start this patient on?? 
  {'A': 'Inhaled salmeterol', 'B': 'Inhaled albuterol', 'C': 'High-dose budesonide', 'D': 'Low-dose fluticasone', 'E': 'Oral prednisone'},