Question: Operalia, The World Opera Competition, helped launch the career of Bulgarian operatic soprano who was born on what day?
Sentence (from "Operalia, The World Opera Competition"): Founded in 1993 by Plácido Domingo, the competition has helped launch the careers of several important artists, such as Joseph Calleja, Giuseppe Filianoti, Rolando Villazón, José Cura, Joyce DiDonato, Elizabeth Futral, Inva Mula, Ana María Martínez and Sonya Yoncheva.
Relevant evidence: Yes