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': 'Abatacept is - \nSelect and explain. \nA. TNF alpha inhibitor, B. Inhibitor of co - stimulation of T cells, C. IL - I receptor antagonist, D. Monoclonal antibody against IL - 6 receptor', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Inhibitor of co-stimulation of T cells o Abatacept inhibits the co - stimulation of T cells by blocking CD28 - CD80/86 interactions and also inhibits the function of antigen presenting cells by reverse signalling through CD80 and CD 86.", 'role': 'assistant'}]