Which Statement Is Incorrect

Multiple Choice

Which statement is incorrect?

A) Cytotoxic T cells release chemicals that destroy targeted cells.
B) Helper T cells enhance the activity of other T cells and B cells.
C) Regulator T cells are believed to play an important role in tolerance to self-antigens.
D) Helper T cells can combine only with host cells bearing both foreign antigen and class I MHC-encoded self-antigens on their surface.
E) The majority of T cells are helper T cells.