De or het topsegment?

The correct Dutch article is:

het topsegment

Rule Words ending in -ment: usually het. See the rule

How to use topsegment

the topsegmenthet topsegment
this topsegmentdit topsegment
that topsegmentdat topsegment
our topsegmentons topsegment
your topsegmentjouw topsegment
every topsegmentelk topsegment
which topsegment?welk topsegment?
a big topsegment / the big topsegmenteen groot topsegment, het grote topsegment