Q: What are released in the respiratory burst having the potent of cell-killing ability?  

Answer: C

Free radicals are molecules that contain one or more unpaired electrons, making them highly reactive and unstable. They are released in the respiratory burst, which is a process that occurs when neutrophils, a type of white blood cell, are activated to fight off an infection. Free radicals have the potent of cell-killing ability, which is why they are so important in the body's defense against infection.

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