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': 'Dexmedetomidine is a \nSelect and explain. \nA. Centrally acting alpha 2 agonist, B. Peripherally acting alpha2 agonist, C. Centrally acting alpha 2 antagonist, D. Peripherally acting alpha 2 antagonist', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: KD Tripathi pharmacology 7th edition (page.no: 384) Dexmedetomidine is a centrally active a2A agonist It is introduced for sedating critically ill/ventilated patients in the intensive care unit. It is used as an adjunct to anaesthesia. Analgesia and sedation are produced with little respiratory depression, amnesia, or anaesthesia', 'role': 'assistant'}]