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
Dexmedetomidine is 
Select and explain. 
A. Selective alpha 2 blocker, B. Agent of choice for conscious sedation, C. Less sensitive to alpha 2 receptors than clonidine, D. Good analgesic
B: Agent of choice for conscious sedation
Answer: B: Agent of choice for conscious sedation 
Explanation: Dexmedetomidine is alpha 2 agonist, more sensitive than clonidine. It is used to produce conscious sedation.