This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
The following drug selectively acts on beta receptors 
Select and explain. 
A. Dopamine, B. Isoprenaline, C. Nor adrenaline, D. Adrenaline
B: Isoprenaline
Answer: B: Isoprenaline 
Explanation: Isoprenaline acts only on beta 1 and beta 2 receptors.