In Literature for sure, and possibly in Movies and/or Television, there is a category with a single letter, where quizzes whose "proper" category would start with that letter, but for which we don't have enough quizzes to set up their own category, can be found. If the challenge has a link, you will immediately see where it is. If not, try the ones I have suggested.
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(Editor in Humanities, Religion, Literature and For Children)
That's all, folks!