Which of the following helps in generating reactive O2 intermediates in the neutrophils?: (A) NADPH oxidase, (B) SOD (superoxide dismutase), (C) Catalase, (D) Glutathione peroxidase
Answer is B. Within the phagocytes, the following reaction takes place:

The initiating enzyme for this process is NADPH oxidase (also called respiratory burst oxidase).
Glutathione peroxidase, glutathione reductase and superoxide dismutase are examples of anti-oxidants. They reduce free radical formation.