When creating a graded quiz you can add instant answer feedback. Instant answer feedback is useful to help your audience understand if their choice was correct or incorrect.
 You can enable or disable instant answer feedback from the configure page.

 You can even provide additional feedback explaining why the answer was correct, or incorrect. It is also possible to embed images or video into this feedback field.

 Here is an example of a graded quiz with instant answer feedback, with additional feedback provided.

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