The correct answer is: Nonfiction
Nonfiction is one of the main categories in literature, it is opposed to fiction. It refers to the written books that are based on real events; helping the readers understand the world. As it addresses reality, real people, places, and events are used and described. Telling the truth is essential for this genre, if the author makes something up then it would be fiction. Actual facts are described, trying to follow the reality in the best way possible.
This categorie is divided in two: literary nonfiction and informative nonfiction.