Which of the following statements regarding sterilization methods is incorrect?

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Dry heat is used to sterilize liquid paraffin.Glass syringes are sterilized by boiling at 169°C for one hour.Flash pasteurization of milk involves heating to 72°C for 15 seconds, then rapidly cooling to 13°C.Ethylene oxide is used to sterilize vaccines.None of the above.

Explanation

Option D is incorrect because ethylene oxide is not used for sterilizing vaccines. Typically, vaccines require sterilization methods that preserve their biological activity, such as filtration or specific chemical treatments, but ethylene oxide is generally unsuitable due to its toxicity and potential to damage vaccine components. The other options correctly describe sterilization techniques for the listed items.