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
[{'content': 'Beta 2 agonist is useful in which condition: \nSelect and explain. \nA. Angina, B. Asthma, C. Delayed labour, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. AsthmaBeta 2 agonist like salbutamol is used for asthma. They are also used for premature contractions. Beta blockers are used for angina.', 'role': 'assistant'}]