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
Which of the following is NOT contraindicated about the use of β blockers in CHF 
Select and explain. 
A. These should be started at very low dose and slowly titrated upwards, B. Carvedilol is most widely used β blocker, C. These are drug of choice in acute decompensated heart failure, D. These can reduce mortality in CHF patients
C: These are drug of choice in acute decompensated heart failure
Answer: C: These are drug of choice in acute decompensated heart failure 
Explanation: Beta blockers are contraindicated in acute decompensated heart failure.