Question: Which of the operas "Elektra" and "Vanessa" had more acts?
Sentence (from "Vanessa (opera)"): It was composed in 1956–1957 and was first performed at the Metropolitan Opera in New York City on January 15, 1958 under the baton of Dimitri Mitropoulos in a production designed by Cecil Beaton and directed by Menotti.
Relevant evidence: No