Secretory IgA is best described as _____
a. a non-inflammatory immunoglobulin that restricts the passage of antigens across mucosal surfaces
b. a complement-activating immunoglobulin that causes destruction of invasive microflora through the membrane-attack complex
c. an opsonizing antibody that facilitates uptake by M cells through Fc receptors
d. an inflammatory immunoglobulin that stimulates the chemotaxis of neutrophils into mucosal surfaces
e. a monomeric IgA that neutralizes antigen effectively at mucosal surfaces.
A
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