This answer, written by who asked the question, is not really an answer, but it should be an edit of the question.
2 Answers
There is a special case in the flag dialog for that:
Not an answer
This was posted as an answer, but it does not answer the question. It should possibly be an edit, a comment, another question, or deleted altogether
Just flag this kind of answers and a moderator can delete them, edit the question or convert them into a comment. But you need to flag these kinds of posts, moderators depend on the community to bring such issues to their attention.
There are also no pro-tem moderators announced yet, although that should happen pretty soon. So the only moderators for now are SE employees that have to divide their attention between multiple sites.
Leaving a comment to educate people is also a possibility.
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Flags for modearator attention age away after 2−4 days; as we don't have pro-tempore moderators, I have created a post here too.– apaderno ModMar 22, 2011 at 6:23
This is a typical rookie mistake, all you can really do, is try to educate people, or downvote these types of answers. It happens on SO as well.
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1And, especially with "rookie mistakes," try and leave a thoughtful, explanatory comment to educate users who come after. May 23, 2011 at 18:23