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 NSAID undergoes enterohepatic circulation - 
Select and explain. 
A. Aspirin, B. Phenylbutazone, C. Piroxicam, D. Ibuprofen
C: Piroxicam
Answer: C: Piroxicam 
Explanation: Ans. is 'c' i.e., Piroxicam o Piroxicam is rapidly and completely absorbed, metabolized in liver by hydroxylation and glucoronide conjugation excreted in urine and bile and undergoes enterohepatic circulation. Hence, it has a long plasma VA of nearly 2 days.