This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
[{'content': 'Which is a selective cyclo-oxygenase-2 inhibitor : \nSelect and explain. \nA. Ketorolac, B. Tolmetin, C. Nabumitone, D. Oxaprozin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' Nabumetone [Ref: KDT 5th/ P180 (page 464, 4,u/e)[* All the drugs mentioned are cyclo-oxygenase inhibitor (both COX-1 & COX-2 are inhibited)But Nabumetone is a more potent COX-2 inhibitor than COX-1 (a selective COX-2 inhibitor)Other selective COX-2 inhibitors areCelecoxib*Rofecoxib*The risk for gastrointestinal bleeding is less with selective COX-2 inhibitors", 'role': 'assistant'}]