De or het basisthema?

The correct Dutch article is:

de basisthema

This word is not in the word lists we use to double-check answers.

How to use basisthema

the basisthemade basisthema
this basisthemadeze basisthema
that basisthemadie basisthema
our basisthemaonze basisthema
your basisthemajouw basisthema
every basisthemaelke basisthema
which basisthema?welke basisthema?
a big basisthema / the big basisthemaeen grote basisthema, de grote basisthema