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 of the following is selective Cox-2 inibitor? \nSelect and explain. \nA. Celcoxib, B. Etoricoxib, C. Parecoxib, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]