/**
 * The valid set of categories that a question can have.
 *
 * @openapi
 *  components:
 *      schemas:
 *          Category:
 *              type: string
 *              enum:
 *                  - music
 *                  - sport_and_leisure
 *                  - film_and_tv
 *                  - arts_and_literature
 *                  - history
 *                  - society_and_culture
 *                  - science
 *                  - geography
 *                  - food_and_drink
 *                  - general_knowledge
 */