Wrong answers should pronounce the right answer
The question says "write this is Japanese", and when the user picks the wrong answer it shouldn't just tell the right answer, you should have the option to play the pronunciation of the sound, as well.
I would categorize this under 'wouldn't it be nice if...', rather than 'should'.
You are able to do this if you click on the discussion link on the bottom of the page (after answering). This will take you to the discussion related to the question you are on in a new tab. This new page will have the proper pronunciation/answer, and posts from other users asking questions and giving answers.