Nobody knows, do they?
because nobody knows the answer
Nobody knows that question.
The Question, the answer, nobody knows.
If nobody knows this secret, who do you think is going to give any possible answer to this question?
nobody knows this question.
Look it up on the computer
Nobody Knows... Mwahaha!
Nobody Knows the answer to that question
Nobody knows the answer to that question.
"Nobody" is an indefinite pronoun in the sentence "Nobody knows the answer to that question." It is indefinite because it does not refer to a specific person, but to an unspecified person.
Nobody knows everything of anything, not even you have a million of them. Only God knows everything.