This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Contraindication of Beta blockers include \nSelect and explain. \nA. Bronchial asthma, B. Variant angina, C. Decompensated hea failure, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Beta blockers cause bronchospasm, vasospasm absolutely contraindicated in acute or decompensated CCF except for carvedilol, hea blocck,COPD,DM.Raynauds syndrome Ref: KD Tripathi; 6th ed; Pg 139.', 'role': 'assistant'}]