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
[{'content': 'Which of the following analgesic is used in arthritis, having 3 times more concentration in synovial fluid than plasma? \nSelect and explain. \nA. Ibuprofen, B. Diclofenac, C. Tenoxicam, D. Piroxicam', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]