Jacopo (Giacomo) Puccini (] ; 26 January 1712 16 May 1781) was an 18th-century Italian composer who lived and worked primarily in Lucca, Tuscany.
 He was the first of five generations of composers, the most famous of whom was his great-great-grandson, the opera composer Giacomo Puccini.
Gianni Schicchi (] ) is a comic opera in one act by Giacomo Puccini to an Italian libretto by Giovacchino Forzano, composed in 1917–18.
 The libretto is based on an incident mentioned in Dante's "Divine Comedy".
 The work is the third and final part of Puccini's "Il trittico" (The Triptych)—three one-act operas with contrasting themes, originally written to be presented together.
 Although it continues to be performed with one or both of the other "trittico" operas, "Gianni Schicchi" is now more frequently staged either alone or with short operas by other composers.
 The aria "O mio babbino caro" is one of Puccini's best known, and one of the most popular arias in opera.
Franco Alfano (Posillipo, Naples, 8 March 1875 – Sanremo, 27 October 1954) was an Italian composer and pianist.
 Best known today for his opera "Risurrezione" (1904) and above all for having completed Puccini's opera "Turandot" in 1926.
 He had considerable success with several of his own works during his lifetime.
Turandot ( ; ] ; ) is an opera in three acts by Giacomo Puccini, completed by Franco Alfano, and set to a libretto in Italian by Giuseppe Adami and Renato Simoni.
Stefano Ronchetti-Monteviti (1814–1882) was an Italian composer, music educator, and college administrator.
 Born in Asti, he joined the faculty of the Milan Conservatory in 1850 as a professor of counterpoint.
 He was appointed the school's director in 1878, a post he held until illness forced him to resign in November 1881.
 He died the following year in Casale Monferrato.
 His notable pupils included Franco Faccio, Giacomo Puccini, and Ivan Zajc.
 His compositional output mainly consists of sacred music.
 His opera "Pergolese" premiered at La Scala on 16 March 1857.
 It used a libretto by Temistocle Solera and starred soprano Maria Spezia-Aldighieri.
Il caso Mortara (The Mortara Case) is an opera in two acts composed by Francesco Cilluffo to an Italian-language libretto by the composer himself, inspired by "The Kidnapping of Edgardo Mortara" by David Kertzer.
 The opera was commissioned by the Dicapo Opera Theater, New York, and premiered in February 2010.
 It is the first Italian opera commissioned to an Italian composer by a New York opera company since the times of Giacomo Puccini at the Metropolitan Opera.
 "New York Times" critic Anthony Tommasini hailed it as one of the most important events of New York's 2010 operatic season.
The Festival Puccini (Puccini Festival) is an annual summer opera festival held in July and August to present the operas of the famous Italian composer Giacomo Puccini.
Tosca (] ) is an opera in three acts by Giacomo Puccini to an Italian libretto by Luigi Illica and Giuseppe Giacosa.
 It premiered at the Teatro Costanzi in Rome on 14 January 1900.
 The work, based on Victorien Sardou's 1887 French-language dramatic play, "La Tosca", is a melodramatic piece set in Rome in June 1800, with the Kingdom of Naples's control of Rome threatened by Napoleon's invasion of Italy.
 It contains depictions of torture, murder and suicide, as well as some of Puccini's best-known lyrical arias.
La fanciulla del West ("The Girl of the West") is an opera in three acts by Giacomo Puccini to an Italian libretto by and , based on the play "The Girl of the Golden West" by the American author David Belasco.
 "Fanciulla" followed "Madama Butterfly", which was also based on a Belasco play.
 The opera has fewer of the show-stopping highlights that are characteristic of other Puccini works, but is admired for its impressive orchestration and for a score that is more melodically integrated than is typical of his previous work.
 "Fanciulla" displays influences from composers Claude Debussy and Richard Strauss, without being in any way imitative.
 Similarities between the libretto and the work of Richard Wagner have also been found, though some attribute this more to the original plot of the play, and have asserted that the opera remains quintessentially Italian.
This is a list of the operas of the Italian composer Franco Alfano (1876–1954).

Question: Franco Alfano,  was an Italian composer and pianist, best known for having completed which of Giacomo Puccini's opera in three acts?
Answer: Turandot