Hi there,
You can have a slide as an explanation slide next to your quiz slides. You can use a conditional advanced action under On Enter property of the explanation slide. With the help of a variable called cpQuizInfoLastSlidePointScored, you will check whether the last answer was correct or not and have the explanation slide show/hide accordingly. For example, if each question in your project has 10 points associated. The variable will check whether the last question slide scored points were equal to 10, if yes then jump to next question slide and if no then go to the explanation slide.
Here is how it will look in the advanced action window:
Where Slide 4 is the next question slide and Slide 3 is the explanation slide.
Hope this helps!
Thanks!