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  is the longest acting NSAID? 
Select and explain. 
A. Aspirin, B. Piroxicam, C. Ibuprofen, D. Acetaminophen
B: Piroxicam
Answer: B: Piroxicam 
Explanation: Piroxicam is the longest acting NSAID because of "enterohepatic recycling".