Task: Question Answering
Input (English): Context: A lost film is a feature or short film that is no longer known to exist in any studio archives, private collections, or public archives, such as the U.S. Library of Congress., The Library of Congress ("LOC") is the research library that officially serves the United States Congress and is the "de facto" national library of the United States. It is the oldest federal cultural institution in the United States. The Library is housed in three buildings on Capitol Hill in Washington, D.C.; it also maintains the Packard Campus in Culpeper, Virginia, which houses the National Audio-Visual Conservation Center., Warner Bros. Entertainment Inc. (known professionally as Warner Bros. Pictures, often referred to as Warner Bros. and Warner Brothers and abbreviated as WB) is an American entertainment company, film studio and film distributor that is a division of Time Warner and is headquartered in Burbank, California. It is one of the "Big Six" major American film studios., A feature film is a film (also called a movie, motion picture or just film) with a running time long enough to be considered the principal or sole film to fill a program. The notion of how long this should be has varied according to time and place. According to the Academy of Motion Picture Arts and Sciences, the American Film Institute, and the British Film Institute, a feature film runs for 40 minutes or longer, while the Screen Actors Guild states that it is 80 minutes or longer., The Jazz Singer is a 1927 American musical film. The first feature-length motion picture with synchronized sound, its release heralded the commercial ascendance of sound films and the decline of the silent film era. Directed by Alan Crosland and produced by Warner Bros. with its Vitaphone sound-on-disc system, the film, featuring six songs performed by Al Jolson, is based on a play of the same name by Samson Raphaelson, adapted from one of his short stories "The Day of Atonement"., A sound film is a motion picture with synchronized sound, or sound technologically coupled to image, as opposed to a silent film. The first known public exhibition of projected sound films took place in Paris in 1900, but decades passed before sound motion pictures were made commercially practical. Reliable synchronization was difficult to achieve with the early sound-on-disc systems, and amplification and recording quality were also inadequate. Innovations in sound-on-film led to the first commercial screening of short motion pictures using the technology, which took place in 1923., Vitaphone was a sound film system used for feature films and nearly 1,000 short subjects made by Warner Bros. and its sister studio First National from 1926 to 1931. Vitaphone was the last major analog sound-on-disc system and the only one which was widely used and commercially successful. The soundtrack was not printed on the film itself, but issued separately on phonograph records. The discs, recorded at  rpm (a speed first used for this system) and typically in diameter, would be played on a turntable physically coupled to the projector motor while the film was being projected. Many early talkies, such as "The Jazz Singer" (1927), used the Vitaphone system. The name "Vitaphone" derived from the Latin and Greek words, respectively, for "living" and "sound"., Smiling Irish Eyes ( 1929 ) is a sound ( All - Talking ) American musical film with Technicolor sequences . The film is now considered a lost film . However , the Vitaphone discs still exist ., Subject: smiling irish eyes, Relation: production_company, Options: (A) american film institute (B) first national (C) paris (D) vitaphone (E) warner bros . (F) washington
Output (English): first national