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
Tocilizumab used against Rheumatoid arthritis is a monoclonal antibody against : 
Select and explain. 
A. Interleukin-6, B. Interleukin-6 receptor, C. Interleukin-5, D. Interleukin-5 receptor
A: Interleukin-6
Answer: A: Interleukin-6 
Explanation: Monoclonal antibody against IL-6 : Tocilizumab               
Monoclonal antibody against IL-6 receptor : Sarilumab
Both are approved for Rheumatoid arthritis.