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
[{'content': 'The following is NOT true about the use of beta–blockers in heart failure: \nSelect and explain. \nA. It should be initiated at very low dose, B. It is most effective in new onset decompensated heart failure, C. Slow upward titration of dose is required, D. Carvedilol is most widely used in this condition', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]