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
Adverse effects of beta–blockers may include: 
Select and explain. 
A. Congestive heart failure, B. Blunting of sympathetic response of oral hypoglycemic drugs, C. Bronchial asthma, D. All of above
D: All of above
Answer: D: All of above 
Explanation: None