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': '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: None', 'role': 'assistant'}]