Question: Which of the following operas is composed of five acts: Anna Bolena or Mireille?

Context articles: Marianna Barbieri-Nini
Mireille (opera)
Bob: A Life in Five Acts
Tragédie en musique
Le chevalier d'Harmental
Elisa Orlandi
Robert le diable
The Power of the Fiend
The Cenci
Anna Bolena

Marianna Barbieri-Nini (18 February 1818 in Florence – 27 November 1887 in Florence) was an Italian operatic soprano who had an active career in Italy's major opera houses from 1840 through 1856.
 She also made appearances at the Liceu in Barcelona, the Teatro Real in Madrid, Her Majesty's Theatre in London, and at theatres in Paris.
 She possessed a powerful voice with coloratura facility and was known for her highly dramatic singing and acting.
 She was especially admired in the title roles of Gaetano Donizetti's "Anna Bolena" and Gioachino Rossini's "Semiramide".
 She was also successful in the operas of Giuseppe Verdi, notably creating roles in the world premieres of three of his works.
Mireille is an 1864 opera in five acts by Charles Gounod to a French libretto by Michel Carré after Frédéric Mistral's poem "Mireio".
 The vocal score is dedicated to George V of Hanover.
Bob: A Life in Five Acts is a play written by actor and playwright Peter Sinn Nachtrieb.
 The play was the winner of the 2010 Barrie and Bernice Stavis Award from the National Theatre Conference.
 It follows the life and adventures of Bob, a man certain of his destiny for greatness, as he struggles to find his purpose.
 Divided into five acts, each section of the play corresponds with a period in Bob’s life.
 In 2012, it was published by Dramatists Play Service, Inc.
Tragédie en musique (Musical tragedy), also known as tragédie lyrique (French lyric tragedy), is a genre of French opera introduced by Jean-Baptiste Lully and used by his followers until the second half of the eighteenth century.
 Operas in this genre are usually based on stories from Classical mythology or the Italian romantic epics of Tasso and Ariosto.
 The stories may not have a tragic ending – in fact, they generally don't – but the atmosphere must be noble and elevated.
 The standard "tragédie en musique" has five acts.
 Earlier works in the genre were preceded by an allegorical prologue and, during the lifetime of Louis XIV, these generally celebrated the king's noble qualities and his prowess in war.
 Each of the five acts usually follows a basic pattern, opening with an aria in which one of the main characters expresses their feelings, followed by dialogue in recitative interspersed with short arias ("petits airs"), in which the main business of the plot occurs.
 Each act traditionally ends with a "divertissement", offering great opportunities for the chorus and the ballet troupe.
 Composers sometimes changed the order of these features in an act for dramatic reasons.
Le chevalier d’Harmental is an opéra comique in five acts of 1896, with music by André Messager and a French libretto by Paul Ferrier, after Dumas père and Auguste Maquet.
 The play of the novel – in five acts, a prologue and ten tableaux – was first performed on 16 July 1849 at the Théâtre-Historique in Paris.
 The opera was first performed at the Opéra Comique (Théâtre Sarah Bernhardt) in Paris on 5 May 1896, but ran for only six performances.
 It was seen at the Vienna Hofoper during the 1896-97 season.
Elisa Orlandi (1811-1834) was an Italian opera singer who was active at major opera houses in Italy from 1829 until her sudden death in 1834.
 Possessing a wide vocal range with a significant amount of coloratura facility, she tackled roles from both the mezzo-soprano and soprano repertoires.
 She is best remembered today for portraying the role of Giovanna Seymour (Jane Seymour) in the world premiere of Gaetano Donizetti's "Anna Bolena" in 1830.
Robert le diable ("Robert the Devil") is an opera in five acts composed by Giacomo Meyerbeer from a libretto written by Eugène Scribe and Germain Delavigne.
 "Robert le diable" is regarded as one of the first grand operas at the Paris Opéra.
 It has only a superficial connection to the medieval legend of "Robert the Devil".
The Power of the Fiend (Russian: Вражья сила , "Vrazhya sila") is an opera in five acts by Alexander Serov, composed during 1867-1871.
 The libretto is derived from a drama by Alexander Ostrovsky from 1854 entitled "Live Not As You Would Like To, But As God Commands".
 The opera was premiered posthumously on 19 April 1871 (Old Style) at the Mariinsky Theatre in Saint Petersburg under Eduard Nápravník.
 Among the performers were Darya Leonova as Spiridonovna and Mikhail Sariotti as Yeryomka.
 Although in many ways it is more far-reaching than Serov's previous two operas, this work was not a success.
The Cenci, A Tragedy, in Five Acts (1819) is a verse drama in five acts by Percy Bysshe Shelley written in the summer of 1819, and inspired by a real Italian family, the House of Cenci (in particular, Beatrice Cenci, pronounced CHEN-chee).
 Shelley composed the play at Rome and at Villa Valsovano near Livorno, from May to 5 August 1819.
 The work was published by Charles and James Ollier, in London in 1819 (see 1819), the Livorno edition, printed in Livorno, Italy by Shelley himself in a run of 250 copies.
 Shelley told Thomas Love Peacock that he arranged for the printing himself because in Italy "it costs, with all duties and freightage, about half of what it would cost in London."
 Shelley sought to have the play staged, describing it as "totally different from anything you might conjecture that I should write; of a more popular kind ... written for the multitude."
 Shelley wrote to his publisher Charles Ollier that he was confident that the play "will succeed as a publication."
 A second edition appeared in 1821, his only published work to go into a second edition during his lifetime.
Anna Bolena is a tragic opera ("tragedia lirica") in two acts composed by Gaetano Donizetti.
 Felice Romani wrote the Italian libretto after Ippolito Pindemonte's "Enrico VIII ossia Anna Bolena" and Alessandro Pepoli's "Anna Bolena", both recounting the life of Anne Boleyn, the second wife of England's King Henry VIII.