What Do I Do with...?

Q Do you know whether there were any left? A No. And the attorney tries to clean up the mess he has created: Q So "No," you don't know? Or, "No," there weren't any left?

Since he is focusing on the word used, the quotes are correct. Since "no" stands for a complete thought, it is capped. You could use a semicolon before "or." Happy punctuating! Margie