Cytotoxic T cells ________.
A) are the only T cells that can directly attack and kill other cells
B) require the double recognition signal of I MHC plus II
C) MHC on the target cell in order to function
D) function mainly to stimulate the proliferation of other T cell populations
E) self-destruct once the antigen has been neutralized
Answer: A) are the only T cells that can directly attack and kill other cells