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 is an anthranilic acid derivative? \nSelect and explain. \nA. Mefenamic acid, B. Sulindac, C. Nimesulide, D. Diclofenac', 'role': 'user'}, {'content': "Answer: A \nExplanation: Mefenamic acid and meclofenamate are N-substituted phenyl anthranilic acids. Sulindac is an indole derivative. Nimesulide is a sulfonanilide derivative Diclofenac is an aryl - acetic acid derivative. Ref: Grosser T., Smyth E. (2011). Chapter 34. Anti-inflammatory, Antipyretic, and Analgesic Agents; Pharmacotherapy of Gout. In L.L. Brunton, B.A. Chabner, B.C. Knollmann (Eds), Goodman & Gilman's The Pharmacological Basis of Therapeutics, 12e.", 'role': 'assistant'}]