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
Which of the following drugs inhibit an enzyme in the prostaglandin synthesis ? 
Select and explain. 
A. Aminocaproic acid, B. Aspirin, C. Aprotinin, D. Alteplase
B: Aspirin
Answer: B: Aspirin 
Explanation: None