If You Were Presented With Three Items,

[sandyRoe]

an apple, a potato, and an onion, and asked which is the odd one out, what would you say?

I'd go for potato because it originated in the Americas.

I believe this was part of the entrance exam to an Oxbridge university, and there's no right answer.

[Hopkirk]

From Wikipedia 

 

The plant develops tubers to store nutrients. These are not roots but stems that form from thickened rhizomes at the tips of long thin stolons. 

[Arksided]

Are going to get it correct on your third guess Hopkirk and go for apple.

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[dustypuss]

I would say onion . Because apples and potatoes don't make me cry when peeling them.

[Hopkirk]

Apple!

[Arksided]

Yeah! 🎈🌟🎉🍰

[sandyRoe]

Onion isn't a bad answer.  You could make alcohol from the other two.

[ToraToraTora]

you can make booze out of onions two, in fact any plant material. Apple is the only sensible answer in the absence of further parameters.

[elliemay1]

If there's no correct answer then I don't see how it matters which one you choose

[sandyRoe]

It's not which one you pick, it's about showing off and displaying your ability to think on your feet.

[elliemay1]

Well then I'd say 'apple' as the other 2 are vegetables and an apple is a fruit, simple!