This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Contraindications of beta blockers are \nSelect and explain. \nA. Asthma, B. Myocardial infarction, C. Hypeension, D. Arrhythmia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:KD Tripathi pharmacology 7th edition (page.no: 146) the beta blocker is contraindicated in asthma because of beta 2 blocking effect (beta 2 agonist cause bronchodilation). Uses of beta blockers are Hypeension, Myocardial infarction, Pheochromocytoma, Cardiac arrhythmias, Thyrotoxicosis, MIGRAINE, essential tremors etc', 'role': 'assistant'}]