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': 'Mechanism of action of asprin is : \nSelect and explain. \nA. Inhibits COX–2 preferentially, B. Inhibits COX–1 preferentially, C. Inhibits COX 1 and COX 2 reversibly, D. Inhibits COX 1 and COX 2 irreversibly', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]