Out of the box you can use Forums or any of the ContentView based controls - ContentView, NewsView, EventsView or BlogPosts. If you use ContentView based controls this will allow you
- to create "questions" from backend or front end. To do this on the front end you have to use the API - Overview of Generic Content API
- you have to enable comments for the provider and content view control you will use. The comments will be used for replies and any further questions.
- you will be able to review and/or moderate all comments from the backend
Despite of these two options I do not see any other built-in module and control that you can use and you have to create a custom module with your own persistence classes.
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