This question already has an answer here:
I am wondering which flag to raise upon catching sight of something like this:
Spam? It's not promoting anything.
Rude or abusive? It's not speaking ill of anything.
Not an answer? Of course it isn't but it isn't even anything meaningful.
BTW, is there archived examples for all kinds of flags? I am curious if there has ever been a question flagged as 'Blatantly Off-Topic'.