This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Asthma, Subject name: Pharmacology
Beta 2 agonist is useful in which condition: 
Select and explain. 
A. Angina, B. Asthma, C. Delayed labour, D. All of the above
B: Asthma
Answer: B: Asthma 
Explanation: Ans. B. AsthmaBeta 2 agonist like salbutamol is used for asthma. They are also used for premature contractions. Beta blockers are used for angina.