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 is a selective cyclooxygenase-2 inhibitor ? \nSelect and explain. \nA. Ketorolac, B. Tolmetin, C. Nabumitone, D. Oxaprozin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Nabumitone o Amongst the given options no drug is selective COX-2 inhibitor. o But Nabumiton is a prefrential COX-2 inhibitor i.e. it has relative COX-2 selectivity --> it inhibits COX-2 more than COX-I. o Other prefrential COX-2 inhibitors are nimesulide and meloxicam.", 'role': 'assistant'}]