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': 'Beta blockers are not indicated in: \nSelect and explain. \nA. Acute CHF, B. Hypertension, C. Chronic CHF, D. Arrhythmia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]