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': 'Selective COX-2 inhibitors are- \nSelect and explain. \nA. Celecoxib, B. Indomethacin, C. Naproxen, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Celecoxib o COX-2 inhibitors are i) Celecoxib iii) Valdecoxib v) Rofecoxib ii) Etoricoxib vi) Lumitracoxib vi) Parecoxib", 'role': 'assistant'}]