Which of the following describes a major component of the Staphylococcus aureus cell wall. It binds to the 'Fc' moiety (stem of the Y-shaped antibody) of IgG, exerting an anti-opsonin (and therefore strongly antiphagocytic) effect
A. capsule
B. protein A
C. cytolytic exotoxins
D. superantigen exotoxins
E. DNAse enzymes
Answer: B. protein A
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