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
Aspirin prolongs bleeding by inhibiting the synthesis of which of the following ? 
Select and explain. 
A. Adenosine receptors, B. Cyclic AMP, C. Prostacyclin, D. Thromboxane A2
D: Thromboxane A2
Answer: D: Thromboxane A2 
Explanation: None