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
NSAID which undergoes enterohepatic circulation 
Select and explain. 
A. Phenylbutazone, B. Piroxicam, C. Aspirin, D. Ibuprofen
B: Piroxicam
Answer: B: Piroxicam 
Explanation: None