How to say in Czech: What is he allergic to?

English
What is allergic to?
Czech
Na co je alergický?
He is allergic to dairy products.
Is he allergic to anything?
He is young.
He lives there.
What is your address?
He doesn’t know what to do anymore.
He just doesn’t know what to say.
He does not understand what the problem is.
This is what he wanted.
What is he cooking?

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