Yuki did a good job of summarizing nearly everything I think on the subject. But, I have a few additional points (I ran out of room in the comments . . .)
I agree with your choice not to post an entire Wiki on the answer. Our job in this type of case should not be to re-create the wiki, but rather direct the user to the proper information source.
If the list can be summarized, do so. It's rare that the answer requires the entire list, but typically 2-5 items off of the list. You can easily say: "The following headers on the list are helpful, the list itself is located at this link . . ."
If the answer absolutely requires a long list, then so be it. This is especially true if the list is something you've created de novo, and it cannot be linked to anywhere.