This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sympathetic System, Subject name: Pharmacology
Mirabegron is a: 
Select and explain. 
A. Beta 3 agonist, B. Beta 3 antagonist, C. Beta 1 agonist, D. Beta 1 antagonist
A: Beta 3 agonist
Answer: A: Beta 3 agonist 
Explanation: Mirabegron is a beta 3 agonist. It is indicated in overactive bladder because Beta 3 receptor stimulation relaxes the bladder. Beta 3 receptor are also present on adipose tissue and cause lipolysis. So, beta 3 agonist can be used as anti-obesity drugs but are not approved yet.