Task: Question Answering
Input (English): Question: Before a 7-month-old girl who comes to the emergency room with a picture suggestive of bronchiolitis, what would be the most probable etiologic agent? 
 Options:  <1> Adenovirus. <2> Parainfluenza virus 1 <3> Influenza B virus <4> Bocavirus <5> Respiratory syncytial virus.
Output (English): 5