<prompt> Monoclonal antibody used for Rheumatoid arthritis:AnakinraLeflunomideAdalimumabSulfasalazine  <response>: 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. 