Memory cells are ________ that function in _______
a. macrophages; removing the debris of an infection
b. T cells; remembering self-antigen, thus protecting the body's cells
c. T cells; determining which B cells will get activated during a second exposure to an antigen
d. B cells; retaining the ability to make an antibody used to fight a previous infection
e. B cells; remembering where to direct macrophages to fight a local infection
D; When an infection stimulates B cells to begin to divide and produce antibodies, some of them are set in reserve. These will respond rapidly to a subsequent infection by the same agent.
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