Q:Answer the following question given this paragraph: After an infection has been brought under control, most cytotoxic T cells die off. However, a few remain as memory cells. If the same pathogen enters the body again, the memory cells mount a rapid immune response. They quickly produce many copies of cytotoxic T cells specific to the antigen of that pathogen. Q: After an infection has been brought under control and most cytotoxic t cells die off, a few remain as what? Choices: - b cells - natural killer cells - control cells - memory cells A:
A:
memory cells