In a safe general anesthetic mixture, the MINIMALLY acceptable percentage of oxygen is

2 explanations

1. 

   Honey

   Inhalation of pure nitrous oxide over a continued period would render a human hypoxic,[5] and the 50% oxygen content prevents this from occurring

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2. 

   sharatpani

   The MINIMUM is 30% oxygen. However that is not an option in this particular question https://emedicine.medscape.com/article/1413427-overview

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