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: Pharmacology
[{'content': 'Which among the following drugs produces a dose ceiling effect? \nSelect and explain. \nA. Morphine, B. Alfentanyl, C. Remifentanyl, D. Buprenorphine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Buprenorphine is a paial mu receptor agonist. Unlike other opiates buprenorphine has a dose ceiling effect to its respiratory depressant dose response curve. Due to this effect, after the ceiling dose is reached additional dose of the drug will not elicit more respiratory depression. Reference: Clinical Anaesthesia edited by Paul, 6e page 490.', 'role': 'assistant'}]