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?
{'answer': 'five', 'supporting_facts': [['Mariya Matveyevna Stepanova', 0], ['Ruslan and Lyudmila (opera)', 0], ['Ruslan and Lyudmila (opera)', 1]]}