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 aspirin is inhibition of : \nSelect and explain. \nA. Thromboxane A2 synthesis, B. Phosphodiesterase, C. HMG-CoA reductase, D. Pancreatic lipase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]