All of the following drugs are bronchodilators EXCEPT one. Which one is the exception?

• Correct answer

  Histamine

• Epinephrine

• Levalbuterol (Xopenex)

• Alb]uterol (ProventiI)

• Salmeterol (Serevent)

• Metaproterenol (Alupent)

• Aminophylline