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: Anaesthesia
[{'content': 'Dexmedetomidine is \nSelect and explain. \nA. Selective alpha 2 blocker, B. Agent of choice for conscious sedation, C. Less sensitive to alpha 2 receptors than clonidine, D. Good analgesic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dexmedetomidine is alpha 2 agonist, more sensitive than clonidine. It is used to produce conscious sedation.', 'role': 'assistant'}]