Hypophora

Hypophora is a rhetorical device where “a writer raises a question and immediately provides an answer.” Usually, the question is asked “in the first paragraph”, and the next paragraph answers the question. “The basic difference between hypophora and a rhetorical question is that in a rhetorical question the answer is not provided since it does not require an answer.” (literarydevices.net).
Example: “Thirty-one cakes, dampened with whiskey, bask on window sills and shelves. Who are they for? Friends. Not necessarily neighbor friends: indeed, the larger share is intended for persons we’ve met maybe once, perhaps not at all. People who’ve struck our fancy. Like President Roosevelt”.
(“A Christmas Memory” by Truman Capote)