Question: Ghena Dimitrova, was a Bulgarian operatic soprano, her voice was known for its power and extension used in operatic roles such as which opera in three acts by Giacomo Puccini, completed by Franco Alfano, and set to a libretto in Italian by Giuseppe Adami and Renato Simoni?
Sentence (from "Il tabarro"): It is the first of the trio of operas known as "Il trittico".
Relevant evidence: No