Storyline 360: Text entry question with 90+ response options - is this possible?

It would be easy to do this in JS, but if you don't want to go that way, it could still be done. You couldn't use a built-in quiz slide; you would have to make your own. The learner would enter into a text entry field, and you would have 90 triggers to check for the presence of each possible correct answer. Then if you want it scored, you would have to put it on a built-in quiz where you can programatically force the correct or incorrect answer, and submit it to be graded. The real problem with all scored text entry questions is that any variation (spelling, capitalization) and the question is marked wrong, even if it's right.

In my opinion, the best option is perhaps drop down choices, especially if you can group them in, say, nine groups. That gives you only ten options in each group, and that's pretty easy to handle.  Ten groups would easily fit on one slide.

The attached sample will give you some ideas on how drop down lists can work. Slide 1 was created for someone who wanted a drop down Multiple Choice quiz. Slide 2 show how it can be adapted to work as menu.  Several of the menu options work differently than others, to show variations of what can be done.