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
Infliximab is : 
Select and explain. 
A. IgG1 chimeric monoclonal antibody against TNF α, B. IgG1 fully human monoclonal antibody against TNF α, C. P75 TNF receptor fusion protein, D. none
A: IgG1 chimeric monoclonal antibody against TNF α
Answer: A: IgG1 chimeric monoclonal antibody against TNF α 
Explanation: None