Which of the following processes does NOT lead to the production of free radicals?

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Routine metabolic activitiesToxic effects of oxygenRestoration of blood flow following ischemic damageEvery option listed aboveNone of the above

Explanation

Free radicals are generated during normal metabolic functions and as a result of oxygen toxicity. Additionally, reperfusion following ischemic injury can cause free radical formation. Therefore, all listed mechanisms except reperfusion after ischemic injury contribute to free radical generation.