This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Beta 2 selective agonist are often effective in \nSelect and explain. \nA. Angina due to cornary insufficiency, B. Asthama, C. Delayed labour, D. All the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref-KDT 6/e p127 Beta 2 agonist are useful in premature uterine contraction to delay labour and not for delayed labour. Beta blockers are used in the treatment of the angina', 'role': 'assistant'}]