A Female Nursing Student States She Has Never Hear of Isoproterenol

A female nursing student states she has never hear of isoproterenol (Isuprel) .While showing the student where the drug literature is kept on the unit,the critical care nurse also shares that it is an effective

A) selective $\alpha$ -adrenergic antagonist.
B) nonselective $\beta$ -adrenergic agonist.
C) $\beta$ ₁-adrenergic antagonist.
D) $\beta$ ₂-adrenergic agonist.