This is a special question that appears only after the flood receded, get the main character to meet with Motonari, please beware that you only got 2 minutes to clear this one (while you are also clearing the other missions which are time limited) and the answers are spread apart so prepare people (the remaining 2 since you need Mori and your main character to meet) in SE and SW corner.
House of the Mori Defeat Motonari Mori's sons, in order from oldest to youngest!
If you managed to clear 9 questions (including the above) (I don't know whether there is a time limit but I cleared them all within 10 minutes), you will get the gold question:
A faithful man Defeat the man who only had one wife!
My EBA "ALL 300" "Jumpin' Jack Flash" multi-screen video: http://www.youtube.com/watch?v=MvLCnKqYWzA