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 NSAID has good tissue penetrability with concentration in synol fluid? \nSelect and explain. \nA. Ketorolac, B. Diclofenac sodium, C. Sulindac, D. Piroxicam', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Diclofenac sodium Diclofenac has good penetrability and achieves good concentration in tissue fluid, e.g. synol fluid.", 'role': 'assistant'}]