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A patient presents with recurrent infections with S. aureus and Serratia marcescens in the form of cutaneous abscesses, lymphadenitis, pneumonia complicated by empyema, and peri-rectal abscess. His defect is in which enzyme:
a) Super-oxide dismutase (SOD)
b) NADPH oxidase
c) catalase
d) G6PD
e) phosphofructokinase (PFK)

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