Suppose I have a post which is assigned to categories A, B and C.
When viewing the post, one should regularly see the output of the_category() as something like: filed under categories A, B, C.
I'd like to exclude one of the catregories to be viewed, although the post will still be assigned to that, meaning - the user will see something like - filed under categories: B, C.
Category A is a fixed one, meaning I will want always to exclude A from being displayed on a post, so it might be even easier.
How can I filter that? Will be happy for ideas.