This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
[{'content': 'In low dose aspirin acts on \nSelect and explain. \nA. Cyclooxygenase, B. Thromboxane A2 syntahse, C. PGI2 synthase, D. Lipooxyngenase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer KDT 6 /e p 609 Aspirin acts by inhibiting the enzyme cyclooxygenase', 'role': 'assistant'}]