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': 'Aspirin prolongs bleeding by inhibiting the synthesis of which of the following? \nSelect and explain. \nA. Adenosine receptors, B. Cyclic AMP, C. Prostacyclin, D. Thromboxane A2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aspirin inactivates cyclo- oxygenase by irreversible acetylation of the enzyme and thereby inhibit the synthesis of thromboxane A2 even in low doses (75mg/day). From medical pharmacology padmaja 4th edition page no 344', 'role': 'assistant'}]