Question: which opera had more acts? Le roi d'Ys or La favorite?
Sentence (from "La favorite"): La Favorite (The Favourite, sometimes referred to by its Italian title: La favorita) is a grand opera in four acts by Gaetano Donizetti to a French-language libretto by Alphonse Royer and Gustave Vaëz, based on the play "Le comte de Comminges" by Baculard d'Arnaud.
Relevant evidence: Yes