"Siapa yang menjual makanan?"

Translation: Who sells food?

[Keith_APP]

What happens if I omit the "yang"?

[lockers001]

Same meaning. My Indo wife says it doesn't matter which version is used.

[__K.]

Well, the connotations are different, though. Compare: What is the one that is red? & What is red?.

[Aiden212598]

I think the only difference is: formal & informal usuage. Duolingo probably teaches only the formal variatn.

[anthony210275]

Can i say "siapa apakah menjual?" instead of "siapa yang menjual?"