This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunomodulator, Subject name: Pharmacology
[{'content': 'Monoclonal antibody used for Rheumatoid arthritis: \nSelect and explain. \nA. Anakinra, B. Leflunomide, C. Adalimumab, D. Sulfasalazine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. AnakinraAnakinra is IL-1 antagonist, leflunomide inhibit the growth of B cells. Adalimumab is monoclonal antibody which inhibit the TNF alpha. Sulfasalazine is DMARD.', 'role': 'assistant'}]