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
Beta blockers are contraindicated in 
Select and explain. 
A. Angina pectoris, B. Cardiac arrhythmia, C. Cardiac failure, D. Myocardial infarction
C: Cardiac failure
Answer: C: Cardiac failure 
Explanation: None