A 15-year-old girl is brought to the emergency department with complaints of shortness of breath for the past 4 hours. She has no history of asthma. Her temperature is 38.3°C (100.9°F), blood pressure is 100/60 mm Hg, pulse is 110/min, and respirations are 22/min. On physical examination, she has diffuse wheezing and distant breath sounds. Which of the following is the most likely diagnosis?
a) Acute asthma exacerbation
b) Anaphylaxis
c) Pneumonia
d) Panic attack