@chachy3324,
Well, the question is
"Can you guess the riddle?"
Not what am I?
Who am I?
or anything, just a yes no question.
If they said a child in Kindergarten can get the answer in 6 seconds, they answered Yes and took a guess, or no and didn't. The question asked if they could guess the riddle, not What is it? or What is the answer to the riddle?
The question was "Can you guess the riddle?"
Can you guess it? Yes or No?
I could guess it, but it may not be right, so I'd lean more towards YES, because I can GUESS it, but that doesn't mean I'd get it right.