i imagine you could do all your looking to do with a widget. i would create a actor for the platform which when activated (overlap, input, etc) would create the widget and set the question category. the categories could be a set of arrays or a datatable which contain the questions.
as for the widget itself you may want to first switch the input mode to ui from game. then you will need to create the buttons which display the answers and a text component which displays the question, you then need to have a script which sets the value of these components based on the question in the array. from there all you need is a way to check if the button clicked is the right answer. to do this you will need on clicked events which run a script to check the answer, id go with something like having each button represented by a number then you check that against a number which represents the correct answer. you could easily store all the information in a struct format (question, answer 1, 2,3,4 right answer).
theres a few posts out there that go into detail on making a system like this (i wrote a few answers myself on it a few months ago).
hope this helps get you started, if you need more help post and i may be able to provide a in depth solution later.