Question: Joséphine de Reszke made her debut in Paris as Ophelia in a grand opera with how many acts?

Context paragraphs:
Le Cid (opera): It was first performed by a star-studded cast at the Paris Opéra on 30 November 1885 in the presence of President Grévy, with Jean de Reszke as Rodrigue.  The staging was directed by Pedro Gailhard, with costumes designed by Comte Lepic, and sets by Eugène Carpezat (Act I), Enrico Robecchi and his student Amable (Act II), Auguste-Alfred Rubé, Philippe Chaperon and their student Marcel Jambon (Act III), and Jean-Baptiste Lavastre (Act IV).  The opera had been seen 150 times there by 1919 but faded from the repertory and was not performed again in Paris until the 2015 revival at the Palais Garnier.  While the opera itself is not in the standard operatic repertory, the ballet suite is a popular concert and recording piece which includes dances from different regions of Spain.

Princess Joséphine of Lorraine: Joséphine de Lorraine (Marie Joséphine Thérèse; 26 August 1753 – 8 February 1797) was a princess of the House of Lorraine and by marriage the Princess of Carignan.  She was the paternal grandmother of King Charles Albert of Sardinia, from whom the modern royal house of Italy descends.

Josephine de Reszke: Joséphine de Reszke, in Polish Józefina Reszke (4 June 1855 – 22 February 1891) was a Polish soprano.  Born in Warsaw, she was the sister of the bass Edouard and the tenor Jean de Reszke, famous singers in their own rights.  She began her studies with her mother and with a Mme. Nissen-Salomon, and made her debut in Paris as Ophelia in Hamlet on 21 June 1875.

Édouard de Reszke: Édouard de Reszke, originally Edward, (22 December 185325 May 1917) was a Polish bass from Warsaw.  Born with an impressive natural voice and equipped with compelling histrionic skills, he became one of the most illustrious opera singers active in Europe and America during the late-Victorian era.

Pentemont Abbey: Pentemont Abbey (French: Abbaye de Penthemont, or Pentemont, or Panthemont, or Pantemont ) is a set of 18th and 19th century buildings at the corner of Rue de Grenelle and Rue de Bellechasse in the 7th arrondissement of Paris.  The abbey was a Cistercian convent founded near Beauvais in 1217 and moved to its current site in Paris in 1672 at the behest of Louis XIV.  A reconstruction of the abbey was initiated in 1745 by the Abbess Marie-Catherine Béthisy de Mézières and work was completed in 1783.  In the late 18th century the abbey was one of the most prestigious educational institutions in Paris for daughters of the elite, including two of Thomas Jefferson's.  The abbey also provided rooms for ladies of good standing who were in search of rest, including Joséphine de Beauharnais when the case of her separation from her first husband was heard.

Auguste Vianesi: Auguste Charles Léonard François Vianesi (2 November 1837 – 4 November 1908) was an opera conductor, born in Italy and later naturalised French.  His repertoire consisted mostly of French and Italian opera, in which he directed some of the world's great singers including Pauline Viardot, Christina Nilsson, Marcella Sembrich, the brothers Edouard and Jean de Reszke, and Feodor Chaliapin in the opera houses of London, Paris, Melbourne, St. Petersburg, Boston and New York.  He retired around the time when sound recording became commercially available, and he seems not to have left any recorded legacy.

Hamlet (opera): Hamlet is a grand opera in five acts of 1868 by the French composer Ambroise Thomas, with a libretto by Michel Carré and Jules Barbier based on a French adaptation by Alexandre Dumas, père, and Paul Meurice of William Shakespeare's play "Hamlet".

Eléonore Denuelle de La Plaigne: Eléonore Denuelle (13 September 1787 – 30 January 1868) was a mistress of Emperor Napoleon I of France and the mother of his son Charles, Count Léon.  Her son was proof that Napoleon was capable of producing an heir and that his wife, Joséphine de Beauharnais, was infertile; as a result, he divorced Joséphine and married Marie Louise of Austria.

Joséphine de Beauharnais: Joséphine de Beauharnais (] ; "née" Tascher de la Pagerie; 23 June 1763 – 29 May 1814) was the first wife of Napoleon I, and thus the first Empress of the French (commonly called Empress Joséphine or just Joséphine).

Josephine of Leuchtenberg: Joséphine of Leuchtenberg or Joséphine de Beauharnais (Joséphine Maximilienne Eugénie Napoléone) (14 March 1807 - 7 June 1876) was Queen consort of Sweden and Norway as the wife of King Oscar I, as well as Princess of Bologna from birth and Duchess of Galliera from 1813.  She was known as "Queen Josefina", and was regarded to be politically active during the reign of her spouse.  She acted as his political adviser and actively participated in state affairs.  She was particularly active within the laws of religion in Sweden and Norway, and is attributed to have introduced more liberal laws regarding religion.

Supporting paragraphs: Josephine de Reszke Hamlet (opera)
Answer: five