Yes! You can add a presentation using Prezi.
Adding a presentation to a question
Prezi presentations can easily be added to your Exam questions as follows.
Go to your Exam > Questions > Create new question > Video or audio:

Now you can add your question, the possible answers, and the view link for your Prezi presentation:

This is what your question will look like when someone is taking the Exam:
You can check the other question types we offer here.
While it's not possible to add a PowerPoint presentation to an Exam question, PowerPoint presentations can be converted to Prezi presentations, check out Prezi's support article on how to do that here.
Adding a presentation to a question
Prezi presentations can easily be added to your Exam questions as follows.
Go to your Exam > Questions > Create new question > Video or audio:

Now you can add your question, the possible answers, and the view link for your Prezi presentation:

This is what your question will look like when someone is taking the Exam:

You can check the other question types we offer here.
While it's not possible to add a PowerPoint presentation to an Exam question, PowerPoint presentations can be converted to Prezi presentations, check out Prezi's support article on how to do that here.