Eli5 How do fruit flies appear even when there’s no fruit?

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Every now and then I’ll be having a glass of wine and one single fruit fly will show up and be gone by the next day. I have no fruit in my house. There’s a few vegetables in the fridge. Everything’s clean and there are none in the trash. I’m so confused. It’s happened a few times.

I know fruit flies appearing has been asked 1000 times but I’ve gone through them and can’t find a question without fruit.

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