Question: Which opera, Iphigénie en Aulide or Lulu,  is an opera in three acts by Alban Berg"?
Sentence (from "Iphigénie en Aulide"): Iphigénie en Aulide ("Iphigeneia in Aulis") is an opera in three acts by Christoph Willibald Gluck, the first work he wrote for the Paris stage.
Relevant evidence: Yes