Helper T (TH) cells recognize antigens when they are bound to a(n)

Helper T (TH) cells recognize antigens when they are bound to a(n) 



A) hapten.
B) immunoglobulin.
C) natural killer cell.
D) major histocompatibility complex (MHC) protein.
E) basophil.


Answer: D) Major histocompatibility complex protein (MHC)


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