All of the riddles have single word answers, as far as I can tell.OK now I'm seriously pissed off.
I went to the source of the "Strange Sound" and met Sphinx there. o followed his dialogue until the riddle.
I know the correct answer is "A Man" since I am fascinated by the story I already knew the answer to the riddle. but Sphinx keeps telling me that the answer is wrong and that I have to try again is it a bug?
Also, yeah, the answer to that one specifically is "Human".