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 analgesic is used in arthritis, having 3 times more concentration in synovial fluid than plasma? 
Select and explain. 
A. Ibuprofen, B. Diclofenac, C. Tenoxicam, D. Piroxicam
B: Diclofenac
Answer: B: Diclofenac 
Explanation: None