When a presented antigen fragment interacts with the T cell receptor of a helper T cell, the co-receptor that must also participate to finalize recognition is

When a presented antigen fragment interacts with the T cell receptor of a helper T cell, the co-receptor that must also participate to finalize recognition is

When a presented antigen fragment interacts with the T cell receptor of a helper T cell, the co-receptor that must also participate to finalize recognition is 









A. CD4.
B. CD8.
C. MHC I.
D. all of these.











Answer: A