Which of the following helps in generating reactive O2 intermediates in the neutrophils?
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.
NADPH oxidase
SOD (superoxide dismutase)
Catalase
Glutathione peroxidase