This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': "True statement about dezocine is: \nSelect and explain. \nA. It is slower acting than morphine, B. It is less potent than morphine, C. It acts GABA receptors, D. It doesn't increase histamine release", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ref: Goodman and Gilman 10/e p602 *Dezocine is slightly more potent and faster acting opioid than morphine with a similar duration of action. It is a paial agonist antagonist opioid. *It is active at u receptors and side effect are similar to those of morphine. *Dezocine doesn't increase plasma histamine and produces less hypotension than morphine or pentazocine. *Dezocine is effective for moderate to severe pain but can cause myocardial depression.", 'role': 'assistant'}]