This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Dobutamine mainly act at this receptor: 
Select and explain. 
A. Beta 1, B. Beta 2, C. Alpha 1, D. Alpha 2
A: Beta 1
Answer: A: Beta 1 
Explanation: (Ref: Katzung, 14th ed. pg. 149; KDT, 6th ed. pg. 126)Dobutamine is a relatively selective b1 agonist. Though it acts on both alpha and beta receptors, the only prominent action of clinically employed doses is its b1 action, i.e. an increase in force of cardiac contraction and output without significant change in HR, BP or peripheral resistance.Use: Heart failure (as an ionotrope)