Hi duckeroo,
if you need to use shortcodes inside of the answers, I’m afraid that this is not possible and will likely never be possible with the default HD Quiz for security reasons. Shortcodes have the power to execute any code, so if I allowed for this it would create a big security hole in the way HD Quiz saves and loads data.
However, one of the following options *might* work for you.
First, although you cannot use shortcodes inside of the answers, I do allow for most basic HTML tags such as strong
to bold, em
for italics, and in your case, sup
for superscript and sub
for subscripts. You can take a look at this for an example. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/sup
If the above does not give you enough control, then another option would be is to use the Multiple Choice: Image question type. This allows you to add an image for each answer. Using this you can create 400x400px images and add your equations to those images (if you do not have photoshop or equivalent, I can wholeheartedly recommend photopea.com – a free web-based Photoshop-like image editor. I’m not affiliated with them in any way – just a fan haha).