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Google added a new content guideline to the documentation for QAPage, relating specifically to pages about STEM education Q&As. Pages where the primary focus is to provide a correct answer to a user-submitted homework question may be eligible for a Q&A carousel experience. These pages may only have a single answer that's provided or selected by in-house experts (instead of users).
The docs also include an example: "An education page where a user submitted a single question, and a top answer is selected by experts."