This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Which of the following group of drugs should be avoided in diabetics? (REPEAT) \nSelect and explain. \nA. a1-blockers, B. a2-blockers, C. b1-blockers, D. b2-blockers', 'role': 'user'}, {'content': 'Answer: D \nExplanation: B2 blockers and non-selective beta blockers are contraindicated in diabetes as they mask the symptoms of hypoglycemia except sweating Cardioselective beta blockers or beta 1 blockers can be given.', 'role': 'assistant'}]