Question: How many operas did the person who wrote Eduardo e Cristina write?

full_context: Document 1: Griselda (A. Scarlatti): Griselda is an opera seria in three acts by the Italian composer Alessandro Scarlatti, the last of Scarlatti’s operas to survive completely today. The libretto is by Apostolo Zeno, with revisions by an anonymous author. Zeno wrote his work in 1701 and it had already been set by Pollarolo and Antonio Maria Bononcini (Albinoni, Giovanni Bononcini and Vivaldi would later produce versions). It is based on the story of Patient Griselda from Boccaccio's "Decameron". Scarlatti's opera was first performed at the Teatro Capranica, Rome in January, 1721 with an all-male cast (five castratos and a tenor).
Document 2: Giulio Sabino: The opera, staged in six or seven European countries at the end of the 18th century, was the subject of a parody in Antonio Salieri's 1786 work "Prima la musica e poi le parole".
Document 3: La Cenerentola: La Cenerentola, ossia La bontà in trionfo (Cinderella, or Goodness Triumphant) is an operatic "dramma giocoso" in two acts by Gioachino Rossini. The libretto was written by Jacopo Ferretti, based on the fairy tale "Cendrillon" by Charles Perrault. The opera was first performed in Rome's Teatro Valle on 25 January 1817.
Document 4: Marino Faliero (opera): Rossini had influenced the management of the Théâtre-Italien to commission works by the outstanding Italian composers of the day—Donizetti and Vincenzo Bellini. Both wrote operas for that house in Paris, Bellini's contribution being the hugely-successful "I puritani". Donizetti's opera, which premiered on 12 March 1835 (a few months after "I puritani") was not nearly as much of a success. However, it marked Donizetti's first opera to have its premiere in Paris.
Document 5: Gaetano Rossi: Gaetano Rossi (18 May 1774 – 25 January 1855) was an Italian opera librettist for several of the well-known "bel canto"-era composers including Gioachino Rossini, Gaetano Donizetti, and Saverio Mercadante in Italy and Giacomo Meyerbeer in one of his early Italian successes. Other composers with whom he worked included Simon Mayr, a composer and Donizetti's teacher, as well as the prolific Giovanni Pacini.
Document 6: La cambiale di matrimonio: La cambiale di matrimonio (The Bill of Marriage or The Marriage Contract) is a one-act operatic farsa comica by Gioachino Rossini to a libretto by Gaetano Rossi. The libretto was based on the play by Camillo Federici (1791) and a previous libretto by Giuseppe Checcherini for Carlo Coccia's 1807 opera, "Il matrimonio per lettera di cambio". The opera debuted on 3 November 1810 at the Teatro San Moisè in Venice
Document 7: Ivanhoé: Ivanhoé is an 1826 pastiche opera in three acts with music by Gioachino Rossini to a French-language libretto by Émile Deschamps and Gabriel-Gustave de Wailly, after Walter Scott's novel of the same name. The music was adapted, with the composer's permission, by the music-publisher Antonio Pacini from Rossini's operas, namely "Semiramide", "La Cenerentola", "La gazza ladra", and "Tancredi" in order to introduce his music to Paris. An examination of the score shows that Pacini also used music from "Bianca e Faliero", "Armida", "Maometto II", "Aureliano in Palmira", "Sigismondo", "Torvaldo e Dorliska", "Mosè in Egitto" and an amount of newly composed music including fanfares and the gallop that was later to become famous from its inclusion in "Guglielmo Tell". The work was premiered on 15 September 1826, at the Odéon Theatre.
Document 8: Gaetano Donizetti: Domenico Gaetano Maria Donizetti (] ; 29 November 1797 – 8 April 1848) was an Italian composer. Along with Gioachino Rossini and Vincenzo Bellini, Donizetti was a leading composer of the "bel canto" opera style during the first half of the nineteenth century. Donizetti's close association with the bel canto style was undoubtedly an influence on other composers such as Giuseppe Verdi (1813–1901).
Document 9: Le comte Ory: Le comte Ory is an opéra written by Gioachino Rossini in 1828. Some of the music originates from his opera "Il viaggio a Reims" written three years earlier for the coronation of Charles X. The French libretto was by Eugène Scribe and Charles-Gaspard Delestre-Poirson adapted from a comedy they had first written in 1817.
Document 10: Sonia Ganassi: Sonia Ganassi (born 1966) is an Italian mezzo-soprano. Born in Reggio Emilia, she made her debut as Rosina in Rossini’s "The Barber of Seville" in Rome in 1992. She has performed in many of the world’s famous opera houses including the Metropolitan Opera in New York City, the Royal Opera House in London and the Teatro alla Scala, Milan. She is best known for her work in the bel canto repertoire. Her roles in Rossini operas include Elisabetta in "Elisabetta, regina d'Inghilterra" (ROF, 2004), Elena in "La donna del lago (Lady of the Lake)" (Rossini in Wildbad, 2006), "Ermione" (ROF, 2008), and Elcia in "Mosè in Egitto" (ROF, 2011). In 2009 she participated in a live recording of Giuseppe Verdi's Messa da Requiem conducted by Antonio Pappano (EMI Classics 6 98936 2).
Document 11: Le donne rivali: Le donne rivali is an intermezzo in two acts by composer Domenico Cimarosa with an Italian libretto by a now unknown poet. It is speculated that Giuseppe Petrosellini may have been the author of the libretto. The opera premiered at the Teatro Valle in Rome during Carnival in 1780. The original choreography was created by Alberto Cavos, the original costumes by Antonio Dian, and the original scenery by Domenico Fossati. Music critics particularly admire the final quintet that closes the opera. In recent years, "Le donne rivali" has been occasionally revived and recorded. In 1991, the Juilliard Opera Center intertwined the work with Mozart's unfinished opera "Lo sposo deluso", which shares the same libretto, to make one large work.
Document 12: Gioachino Rossini: Gioachino Antonio Rossini (] ; 29 February 179213 November 1868) was an Italian composer who wrote 39 operas, as well as some sacred music, songs, chamber music and piano pieces.
Document 13: Eduardo e Cristina: Eduardo e Cristina (] ) is an operatic 'dramma' in two acts by Gioachino Rossini to an Italian libretto originally written by Giovanni Schmidt for "Odoardo e Cristina" (1810), an opera by Stefano Pavesi, and adapted for Rossini by Andrea Leone Tottola and Gherardo Bevilacqua-Aldobrandini.
Document 14: Rossini Opera Festival: The Rossini Opera Festival (ROF) is an international music festival held in August of each year in Pesaro, Italy, the birthplace of the opera composer Gioachino Rossini. Its aim, in addition to studying the musical heritage of the composer, is to revive and perform his works in a unique setting that allows collaboration of scholars, artists, and audience. It is often simply referred to as the Pesaro Festival.
Document 15: Rita (opera): In 1841, while Donizetti was in Paris waiting for the libretto to be completed for a commission by La Scala, he had a chance encounter with Gustave Vaëz, who had co-written the libretti for two of his earlier operas, "Lucie de Lammermoor" (the French version of "Lucia di Lammermoor") and "La favorite". He asked Vaëz if he could provide a libretto for a short opera to keep him busy while waiting for the La Scala project to advance. Vaëz quickly created "Deux hommes et une femme" ("Two Men and a Woman"), a comic piece in one act consisting of eight musical numbers connected by spoken dialogue. According to Vaëz, Donizetti completed the score in eight days. However, the Opéra-Comique rejected it and Donizetti then had the libretto translated into Italian for an intended performance at the Teatro del Fondo in Naples. Following the death of the Teatro del Fondo's impresario, Domenico Barbaja, the Naples performance fell through. The score, still unperformed, was found in Donizetti's effects when he died in 1848.
ground_truth: 39