Question: Are the Manon Lescaut, a four act opera composed between 1890 and 1893 and Rusalka, one of the most successful Czech operas both by Antonín Dvořák?
Sentence (from "Yveta Synek Graff"): Yveta Synek Graff (November 18, 1933, Prague, Czechoslovakia — November 6, 2015, Montecito, California) was a vocal and language coach and writer who helped popularize the performances of Czech operas internationally during the last quarter of the 20th century and early 21st century.
Relevant evidence: No