During the course of an intestinal infection with Salmonella enteritidis, the B cells undergo class switching; what switching is most likely to occur and what causes the switch?
a. IgD to IgE; B-cell cytokines
b. IgM to IgA; T-cell cytokines
c. IgG to IgM; B-cell cytokines
d. IgA to IgG; T-cell cytokines
e. IgD to IgM; T-cell cytokines
Answer: IgM to IgA; T-cell cytokines
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