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
Which of the following group of drugs should be avoided in diabetics? (REPEAT) 
Select and explain. 
A. a1-blockers, B. a2-blockers, C. b1-blockers, D. b2-blockers
D: b2-blockers
Answer: D: b2-blockers 
Explanation: 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.