Please answer the following question: Information:  - Costume is the distinctive style of dress of an individual or group that reflects their class, gender, profession, ethnicity, nationality, activity or epoch.  - Filmmaking (or in an academic context, film production) is the process of making a film. Filmmaking involves a number of discrete stages including an initial story, idea, or commission, through screenwriting, casting, shooting, sound recording and reproduction, editing, and screening the finished product before an audience that may result in a film release and exhibition. Filmmaking takes place in many places around the world in a range of economic, social, and political contexts, and using a variety of technologies and cinematic techniques. Typically, it involves a large number of people, and can take from a few months to several years to complete.  - Epic film is a style of filmmaking with large scale, sweeping scope, and spectacle. The usage of the term has shifted over time, sometimes designating a film genre and at other times simply synonymous with big budget filmmaking. Like epics in the classical literary sense it is often focused on a heroic character. An epic's ambitious nature helps to set it apart from other types of film such as the period piece or adventure film. Epic historical films would usually take a historical or a mythic event and add an extravagant setting and lavish costumes, accompanied by an expansive musical score with an ensemble cast, which would make them among the most expensive of films to produce. The most common subjects of epic films are royalty, and important figures from various periods in world history.  - An audience is a group of people who participate in a show or encounter a work of art, literature (in which they are called "readers"), theatre, music (in which they are called "listeners"), video games (in which they are called "players"), or academics in any medium. Audience members participate in different ways in different kinds of art; some events invite overt audience participation and others allowing only modest clapping and criticism and reception.  - A film, also called a movie, motion picture, theatrical film or photoplay, is a series of still images which, when shown on a screen, creates the illusion of moving images due to the phi phenomenon. This optical illusion causes the audience to perceive continuous motion between separate objects viewed rapidly in succession. The process of filmmaking is both an art and an industry. A film is created by photographing actual scenes with a motion picture camera; by photographing drawings or miniature models using traditional animation techniques; by means of CGI and computer animation; or by a combination of some or all of these techniques and other visual effects.  - Computer animation is the process used for generating animated images. The more general term computer-generated imagery (CGI) encompasses both static scenes and dynamic images, while computer animation "only" refers to the moving images. Modern computer animation usually uses 3D computer graphics, although 2D computer graphics are still used for stylistic, low bandwidth, and faster real-time renderings. Sometimes, the target of the animation is the computer itself, but sometimes film as well.  - The phi phenomenon is the optical illusion of perceiving a series of still images, when viewed in rapid succession, as continuous motion. Max Wertheimer, one of the three founders of Gestalt psychology, defined this phenomenon in 1912. The phi phenomenon and persistence of vision together formed the foundation of Hugo Münsterberg's theory of film and are part of the process of motion perception.  - Grand opera is a genre of 19th-century opera generally in four or five acts, characterized by large-scale casts and orchestras, and (in their original productions) lavish and spectacular design and stage effects, normally with plots based on or around dramatic historic events. The term is particularly applied (sometimes specifically using in its French language equivalent grand opéra) to certain productions of the Paris Opéra from the late 1820s to around 1850; 'grand opéra' has sometimes been used to denote the Paris Opéra itself.  - Opera (English plural: "operas"; Italian plural: "opere" ) is an art form in which singers and musicians perform a dramatic work combining text (libretto) and musical score, usually in a theatrical setting. In traditional opera, singers do two types of singing: recitative, a speech-inflected style and arias, a more melodic style. Opera incorporates many of the elements of spoken theatre, such as acting, scenery, and costumes and sometimes includes dance. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor.  - A background actor or extra is a performer in a film , television show , stage , musical , opera or ballet production , who appears in a nonspeaking or nonsinging ( silent ) capacity , usually in the background ( for example , in an audience or busy street scene ) . War films and epic films often employ background actors in large numbers : some films have featured hundreds or even thousands of paid background actors as cast members ( hence the term ' cast of thousands ' ) . Likewise , grand opera can involve many background actors appearing in spectacular productions . On a film or TV set , background actors are usually referred to as `` background talent '' , `` background performers '' , `` background artists '' , `` background cast members '' or simply `` background '' while the term `` extra '' is rarely used . In a stage production , background actors are commonly referred to as `` supernumeraries '' . In opera and ballet , they are called either `` extras '' or `` supers '' .  - Art is a diverse range of human activities in creating visual, auditory or performing artifacts (artworks), expressing the author's imaginative or technical skill, intended to be appreciated for their beauty or emotional power. In their most general form these activities include the production of works of art, the criticism of art, the study of the history of art, and the aesthetic dissemination of art.  - Animation is the process of making the illusion of motion and the illusion of change by means of the rapid display of a sequence of images that minimally differ from each other. The illusionas in motion pictures in generalis thought to rely on the phi phenomenon. Animators are artists who specialize in the creation of animation. Animation can be recorded with either analogue media, a flip book, motion picture film, video tape, digital media, including formats with animated GIF, Flash animation, and digital video. To display animation, a digital camera, computer, or projector are used along with new technologies that are produced.  - In filmmaking, visual effects (abbreviated VFX) are the processes by which imagery is created and/or manipulated outside the context of a live action shot.     After reading the paragraphs above, we are interested in knowing the entity with which 'extra ' exhibits the relationship of 'instance of'. Find the answer from the choices below.  Choices: - animation  - art  - book  - century  - computer  - computer animation  - computer graphics  - criticism  - exhibition  - film  - filmmaking  - foundation  - four  - genre  - gestalt  - group  - house  - human  - industry  - language  - libretto  - may  - musical  - musical ensemble  - opera  - part  - people  - performance  - phenomenon  - process  - product  - profession  - range  - rapid  - recitative  - result  - scale  - sequence  - series  - show  - sound  - speech  - stage  - study  - style  - text  - three  - time  - two  - work of art
A:
profession