De or het beginthema?

The correct Dutch article is:

de beginthema

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

How to use beginthema

the beginthemade beginthema
this beginthemadeze beginthema
that beginthemadie beginthema
our beginthemaonze beginthema
your beginthemajouw beginthema
every beginthemaelke beginthema
which beginthema?welke beginthema?
a big beginthema / the big beginthemaeen grote beginthema, de grote beginthema