Question: Cecilia Young, one of the greatest English Sopranos of the 18th Century is in which Opera seria by George Frideric Handel ?
Context: Siroe, re di Persia ("Siroes, King of Persia", HWV 24), is an opera seria in three acts by George Frideric Handel.  It was his 12th opera for the Royal Academy of Music and was written for the sopranos Francesca Cuzzoni and Faustina Bordoni.  The opera uses an Italian-language libretto by Nicola Francesco Haym, after Metastasio's "Siroe".  Like many of Metastasio's libretti, it was also set by Handel's contemporaries, e.g. by Leonardo Vinci, Antonio Vivaldi and Johann Adolph Hasse (see Hasse's "Siroe").  Pasquale Errichelli's setting of the libretto (see Errichelli's "Siroe") premiered in the year of Handel's death. The Choice of Hercules (HWV 69) is an oratorio in one act (three scenes) by George Frideric Handel.  Handel produced the score between 28 June and 5 July 1750.  The first performance was given on 1 March 1751 at the Covent Garden Theatre, London with Cecilia Young as Virtue, Isabella Young as Hercules, and Thomas Lowe (tenor) as attendant.  The libretto is derived from the poem (1743) of Robert Lowth but revised, probably, by Thomas Morell. George Frideric Handel's operas comprise 42 musical dramas that were written between 1705 and 1741 in various genres.  He began composing operas in Germany and then for a brief time in Italy to modest success.  It was not until he moved to England that he found great success in the genre.  His first opera in England, "Rinaldo" (1711), was met with enthusiasm, and several more Italian operas soon followed.  However, Handel's place as the central figure of opera in England during the eighteenth century was not solidified until, under the influence of Thomas Arne, he began composing large-scale works with English language texts.  Though almost all his English language works are technically oratorios and not operas, several of them, such as "Semele" (1743), have become an important part of the opera repertoire.  Handel's first opera (opera seria - serious Italian opera) was "Almira" (1705). Alcina (HWV 34) is an opera seria by George Frideric Handel.  Handel used the libretto of "L'isola di Alcina", an opera that was set in 1728 in Rome by Riccardo Broschi, which he acquired the year after during his travels in Italy.  Partly altered for better conformity, the story was originally taken from Ludovico Ariosto's "Orlando furioso" (like those of the Handel operas "Orlando" and "Ariodante"), an epic poem.  The opera contains several musical sequences with opportunity for dance: these were composed for dancer Marie Sallé. Poro, re dell'Indie ("Porus, King of the Pakistani region", HWV 28) is an opera seria in three acts by George Frideric Handel.  The Italian-language libretto was adapted from "Alessandro nell'Indie" by Metastasio, and based on Alexander the Great's encounter with King Porus in 326 BC.  The libretto had already been set to music by Leonardo Vinci in 1729 and by Antonio Vivaldi among others and was used as the text for more than sixty operas throughout the 18th century. Muzio Scevola ("Mucius Scaevola", HWV 13) is an opera seria in three acts about Gaius Mucius Scaevola.  The Italian-language libretto was by Paolo Antonio Rolli, adapted from a text by Silvio Stampiglia.  The music for the first act was composed by Filippo Amadei (family name sometimes given as Mattei), the second act by Giovanni Bononcini, and the third by George Frideric Handel.  Collaborations of groups of composers were common in the 18th century, though this is the only one done in London.  Bononcini had written the music for two earlier treatments of this story on his own, works dating from 1695 and 1710. Cecilia Young (also Cecilia Arne) (January 1712 – 6 October 1789) was one of the greatest English sopranos of the eighteenth century, the wife of composer Thomas Arne, and the mother of composer Michael Arne.  According to music historian Charles Burney, she had "a good natural voice and a fine shake [and] had been so well taught, that her style of singing was infinitely superior to that of any other English woman of her time".  She was part of a well-known English family of musicians that included several professional singers and organists.  Young enjoyed a large amount of success through her close association with George Frideric Handel.  She appeared in several of his oratorios and operas including the premieres of "Ariodante" (1735), "Alcina" (1735), "Alexander's Feast" (1736) and "Saul" (1739). Flavio, re de' Longobardi ("Flavio, King of the Lombards", HWV 16) is an opera seria in three acts by George Frideric Handel.  The Italian-language libretto was by Nicola Francesco Haym, after Matteo Noris's "Flavio Cuniberto".  It was Handel's fourth full-length opera for the Royal Academy of Music.  Handel had originally entitled the opera after the character of Emilia in the opera. Ezio ("Aetius", HWV 29) is an opera seria by George Frideric Handel to a libretto by Metastasio.  Metastasio's libretto was partly inspired by Jean Racine's play "Britannicus".  The same libretto had already been set by many other composers first of all Nicola Porpora who managed to preempt the official Rome premiere of Pietro Auletta's setting for 26 December 1728 with his own version (of a slightly edited copy of the libretto) for Venice on 20 November, a month earlier.  The libretto continued to be set and reset for another 50 years, including two versions of "Ezio" by Gluck.  Handel's "Ezio" is considered one of the purest examples of opera seria with its absence of vocal ensembles. Rodelinda, regina de' Longobardi (HWV 19) is an opera seria in three acts composed for the first Royal Academy of Music by George Frideric Handel.  The libretto is by Nicola Francesco Haym, and was based on an earlier libretto by Antonio Salvi set by Giacomo Antonio Perti in 1710.  Salvi's libretto originated with Pierre Corneille's play "Pertharite, roi des Lombards" (1653), based on the history of Perctarit, king of the Lombards in the 7th century.  "Rodelinda" has long been regarded as one of Handel's greatest works.
Answer: Alcina