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': 'Selective alpha 2 agonist is \nSelect and explain. \nA. Tizanidine, B. Prazosin, C. Adrenaline, D. Propanolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: HL Sharma 3rd ed pg no:180 Clonidine, methyldopa, tizanidine, relminidine are central alpha 2 agonists', 'role': 'assistant'}]