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': 'All are TNF-alpha antagonists used in rheumatoid arthritis except: \nSelect and explain. \nA. Ifosfamide, B. Infliximab, C. Etanercept, D. Adalimumab', 'role': 'user'}, {'content': "Answer: A \nExplanation: SOME IMPORTANTLY USED TNF - ALPHA INHIBITORS ARE AS FOLLOWS:\n\nEtanercept :\xa0Chimeric protein and neutralizes both TNF alpha and TNF beta\xa0can be used along with methotrexate in rheumatoid arthritis\xa0also used in ankylosing spondylosis, juvenile arthritis and plaque psoriasis.\nInfliximab :\xa0Monoclonal antibody against TNF alpha.used in refractory rheumatoid arthritis, fistulating Crohn's disease, ulcerative colitis and psoriasis.\nAdalimumab :\xa0Fully human recombinant antibody anti TNF alpha. It is less antigenic.use same as infliximab.", 'role': 'assistant'}]