"Vilket är dess ursprung?"

Translation: What is its origin?

[Vedun]

Why not vad är dess ursprung?

[Arnauti]

vad also works very well in Swedish here.

[Helmut83]

A short explanation about the "dess" word, please? I don't think I have seen it before in the course.

[devalanteriel]

It means "its" - it's that simple. :)

[Helmut83]

Easy to understand and remember. Thank you!

[AnnemiekeR3]

Would 'what is the source of this' mean the same?
(it was marked wrong)