Answers can be flagged as "not an answer", the description for which says the following:
This was posted as an answer, but it does not attempt to answer the question. It should possibly be an edit, a comment, another question, or deleted altogether.
Often, if I raise this kind of flag, I find that it is disputed or declined. The latest example is this answer, which to me is clearly either a comment or maybe even another question, but doesn't really come close to what I would consider an answer.
Why was my flag declined on this (not an) answer?
Extra reading for general use of the flag:
- How do I properly use the "Not an Answer" flag?
- Can we have an unambiguous, official ruling on what the "not an answer" flag is for?
- The limits to a Very Low Quality answer (about the "Very Low Quality" flag rather than the "Not An Answer" flag)