De or het non-discussie?

The correct Dutch article is:

de non-discussie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use non-discussie

the non-discussiede non-discussie
this non-discussiedeze non-discussie
that non-discussiedie non-discussie
our non-discussieonze non-discussie
your non-discussiejouw non-discussie
every non-discussieelke non-discussie
which non-discussie?welke non-discussie?
a big non-discussie / the big non-discussieeen grote non-discussie, de grote non-discussie