What causes onion allergies...?!

Question: What causes onion allergies!.!.!.!?
Answers:

Stinging eyes!? Not an allergy per se!. Basically free sulphur(-like) gasses that reach your eyes, react with the water therein, and form dilute sulphuric acid!.Www@Answer-Health@Com

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What causes onion allergies...?!

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