Generate a question with a factual answer.
Generated: What year did Sony first exhibit the use of an optical digital audio disc?

Generate a question with a factual answer.
Generated: Hogarth makes no mention of what?

Generate a question with a factual answer.
Generated: When did these groups make the migration ?

Generate a question with a factual answer.
Generated: I couldn't could up with another question. But i need to fill this space because I can't submit the hit.