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Abatacept is -

A
TNF alpha inhibitor
B
Inhibitor of co - stimulation of T cells
C
IL - I receptor antagonist
D
Monoclonal antibody against IL - 6 receptor
High-Yield Explanation
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.
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