Not sure how to "fix" this, but it was showing "yi1".
The first possible answer was "I" (the letter), but
it looks like a one! because of the font used to show
the answers.
I think you need to switch to a serif font for the
answer key. However, this is pretty minor.
The user is able to choose the font that is most clear to them in Window -> Preferences -> Fonts -> Default font.
With this feature, this request to "switch to a serif font for the answer key" is fulfilled. Closed-fixed.