Question: Which contained more acts, Macbeth or Les mamelles de Tirésias?
Sentence (from "Les mamelles de Tirésias"): Les mamelles de Tirésias ("The Breasts of Tiresias") is an "opéra bouffe" by Francis Poulenc, in a prologue and two acts based on the play of the same title by Guillaume Apollinaire.
Relevant evidence: Yes