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i think the answer is a toxin

Alcohol is a toxin. So the correct option is A. Toxin kills cells such as microorganisms, that's why alcohol is used  to preserve food and sterilise skin, needles etc.

What is toxin?

Toxin is a naturally occurring organic poison produced by metabolic activities of living cells or organisms. Toxins occur especially as a protein or conjugated protein.

Alcohol can kills humans too. A dose only four times as high as the amount that would make blood levels exceed and can lead to death.

For more information regarding alcohol, visit:

https://brainly.com/question/947751

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