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
[{'content': 'Adverse effects that limit the use of adrenoceptor blockers include: \nSelect and explain. \nA. Bronchoconstriction from α blocking agents, B. Heart failure exacerbation from β blockers, C. Impaired blood sugar response with α blockers, D. Increased intraocular pressure with β blockers', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]