De or het studiegeest?

The correct Dutch article is:

de studiegeest

How to use studiegeest

the studiegeestde studiegeest
this studiegeestdeze studiegeest
that studiegeestdie studiegeest
our studiegeestonze studiegeest
your studiegeestjouw studiegeest
every studiegeestelke studiegeest
which studiegeest?welke studiegeest?
a big studiegeest / the big studiegeesteen grote studiegeest, de grote studiegeest