Question: A Life for the Tsar is a  Russian libretto with four acts, Tosca an Italian libretto has how many acts?
Sentence (from "The Gambler (Prokofiev)"): The Gambler (Russian: Игрок — "Igrok" in transliteration) is an opera in four acts by Sergei Prokofiev to a Russian libretto by the composer, based on the story of the same name by Fyodor Dostoyevsky.
Relevant evidence: No