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
[{'content': 'Which of the following drugs inhibit platelet cyclooxygenase reversibly? \nSelect and explain. \nA. Alprostadil, B. Aspirin, C. Ibuprofen, D. Prednisolone', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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 .", 'role': 'assistant'}]