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
Cycloxygenase enzyme is not inhibited by : 
Select and explain. 
A. Aspirin, B. Warfarin, C. Phenylbutazone, D. Diclofenac
B: Warfarin
Answer: B: Warfarin 
Explanation: None