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': 'Tocilizumab used against Rheumatoid arthritis is a monoclonal antibody against : \nSelect and explain. \nA. Interleukin-6, B. Interleukin-6 receptor, C. Interleukin-5, D. Interleukin-5 receptor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Monoclonal antibody against IL-6 : Tocilizumab\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nMonoclonal antibody against IL-6 receptor : Sarilumab\nBoth are\xa0approved for Rheumatoid arthritis.', 'role': 'assistant'}]