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 one of the following is aspirin ? \nSelect and explain. \nA. Methyl salicylate, B. Para–aminobenzoic acid, C. Para–aminosalicylic acid, D. Acetyl salicylic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]