This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
Which NSAIDs undergoes enterohepatic circulation 
Select and explain. 
A. Phenylbutazone, B. Aspirin, C. Ibuprofen, D. Piroxicam
D: Piroxicam
Answer: D: Piroxicam 
Explanation: Piroxicam is a long acting analgesic due to enterohepatic circulation. single daily dose is usually sufficient. Refer kDT 6/e p194