Question: Il trovatore and Lady Macbeth of the Mtsensk District, are which type of theater?
Sentence (from "Alexander Preys"): Alexander Preis (Russian: Александр Прейс ; 1905–1942) was a Russian writer of numerous plays and libretti, including those for Shostakovich's operas "The Nose" and "Lady Macbeth of the Mtsensk district".
Relevant evidence: No