This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
Which of the following drugs inhibit platelet cyclooxygenase reversibly? 
Select and explain. 
A. Alprostadil, B. Aspirin, C. Ibuprofen, D. Prednisolone
C: Ibuprofen
Answer: C: Ibuprofen 
Explanation: NSAID'S Inhibit COX enzyme reversibly, Except Aspirin which is an irreversible inhibitor of this enzyme . Alprostadil -PGE1 and prednisolone do not inhibit cox enzyme .