This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Beta agonist which is used for stopping premature labor is: 
Select and explain. 
A. Carvedilol, B. Terbutaline, C. Pindolol, D. Nadolol
B: Terbutaline
Answer: B: Terbutaline 
Explanation: None