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': 'Infliximab is : \nSelect and explain. \nA. IgG1 chimeric monoclonal antibody against TNF α, B. IgG1 fully human monoclonal antibody against TNF α, C. P75 TNF receptor fusion protein, D. none', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]