What about a multi-answer question?
53950
List questions: Community Wiki?
120140
What to do with an additional answer which IMHO explains only a small portion of the question, while another answer explains more
89795
Which answer should I accept?
93630
"Answerer" and "asker"
1084
What is this type of question called?
76005
Is a short description of a question OK if self-answering?
133926
What if 2 answers are essentially the same?
15852
Posting and answering questions you have already found the answer to
89278
Set Some conditions to answer my question
111780
How should we deal with questions that fit on more than one Stack Exchange site?
148502
Two accepted answers
25105
Suggestion phrased as a question
154748
What can we do to encourage (or discourage) a second question?
76231
How to get a new answer for an old question
61584
When is a duplicate question not a duplicate?
115812
Allow locking of answers
140926
Can I re-ask a question if it hasn't been answered?