Foaly is a fictional character in the Artemis Fowl series written by Eoin Colfer. He is the technical consultant to the Lower Elements Police (LEP). He is the most intelligent centaur on and under the Earth, considers himself to be an unappreciated genius, and is the inventor of most of the advanced technology possessed by the fairy world, rivaled only by Opal Koboi.
Question: Opal Koboi is Foaly's rival in the fairy world True, False, or Neither? 