nbde 2005 released (wrong answer?)

[pistolpete007]

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question number 117....which of the following represents the primary function of sIgA?
A. aggregates microrganisms and prevents colonization
B. Activates complement in secretory fluids

The answer is A....BUT i think it is B...Kaplan says "the secretory form (sIgA) is found in tears, colostrum, saliva, milk , and other secretions

 

[prez_al]

question number 117....which of the following represents the primary function of sIgA?
A. aggregates microrganisms and prevents colonization
B. Activates complement in secretory fluids

The answer is A....BUT i think it is B...Kaplan says "the secretory form (sIgA) is found in tears, colostrum, saliva, milk , and other secretions

Only IgG and IgM activate complement. IgA will bind to antigens and get them ready to be presentd to APCs (B cells and macrophages)