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
Which of the following anti inflammatory drug is a COX- 2 inhibitor: 
Select and explain. 
A. Aspirin, B. Ketoprofen, C. Rofecoxib, D. Sulidec
C: Rofecoxib
Answer: C: Rofecoxib 
Explanation: None