Which of the following compounds is the most reactive toward electrophilic aromatic substitution? 
Definitions:
RSV
Respiratory Syncytial Virus, a common and highly contagious virus that causes respiratory infections, particularly in children.
Bronchiolitis
An inflammatory respiratory condition often caused by a viral infection, primarily affecting the small airways (bronchioles) in the lungs, commonly seen in young children.
Pneumonia
An infectious respiratory condition characterized by the inflammation of the air sacs (alveoli) in one or both lungs, often filled with fluid or pus.
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