Question: How many acts are in the opera based on an 1820 poem by Alexander Pushkinhave, in which Mariya Matveyevna Stepanova created the lead soprano role?
Sentence (from "Ruslan and Lyudmila (opera)"): The Russian libretto was written by Valerian Shirkov, Nestor Kukolnik and N. A. Markevich, among others.
Relevant evidence: No