Please answer the following question: Information: - The cello (; plural cellos or celli) or violoncello is a bowed string instrument with four strings tuned in perfect fifths. The strings from low to high are generally tuned to C, G, D and A, an octave lower than the viola. It is a member of the violin family of musical instruments, which also includes the violin and viola. - Doom metal is an extreme style of heavy metal music that typically uses slower tempos, low-tuned guitars and a much "thicker" or "heavier" sound than other metal genres. Both the music and the lyrics intend to evoke a sense of despair, dread, and impending doom. The genre is strongly influenced by the early work of Black Sabbath, who formed a prototype for doom metal with songs such as "Black Sabbath", "Children of the Grave", "Electric Funeral" and "Into the Void". During the first half of the 1980s, a number of bands from England (Pagan Altar, Witchfinder General), the United States (Pentagram, Saint Vitus, Trouble) and Sweden (Candlemass, Count Raven) defined doom metal as a distinct genre. - The flute is a family of musical instruments in the woodwind group. Unlike woodwind instruments with reeds, a flute is an aerophone or reedless wind instrument that produces its sound from the flow of air across an opening. According to the instrument classification of HornbostelSachs, flutes are categorized as edge-blown aerophones. - The violin is a wooden string instrument in the violin family. It is the smallest and highest-pitched instrument in the family in regular use. Smaller violin-type instruments are known, including the violino piccolo and the kit violin, but these are virtually unused in the 2010s. The violin typically has four strings tuned in perfect fifths, and is most commonly played by drawing a bow across its strings, though it can also be played by plucking the strings with the fingers (pizzicato). Violins are important instruments in a wide variety of musical genres. They are most prominent in the Western classical tradition and in many varieties of folk music. They are also frequently used in genres of folk including country music and bluegrass music and in jazz. Electric violins are used in some forms of rock music; further, the violin has come to be played in many non-Western music cultures, including Indian music and Iranian music. The violin is sometimes informally called a fiddle, particularly in Irish traditional music and bluegrass, but this nickname is also used regardless of the type of music played on it. - Andrew Tompkins is the lead vocalist and bassist for the Australian doom metal band Paramaecium , which was considered to be the biggest Christian doom metal band . Andrew has a daughter named Enara . Tompkins has also written a book entitled '' Within the Ancient Forest '' . The Paramaecium album of the same name was based on this novel . - Paramaecium (sometimes typeset as Paramcium) was an Australian death/doom metal band formed in 1991. There is use of instrumentation like flutes, cellos and violins on some albums. Paramaecium is one of the few doom metal bands that focus on Christian lyrical themes and Christian concepts. According to Doom-metal.com, "what sets Paramaecium apart from other bands in the doom metal scene, is the fact that they are the only Christian death/doom band that made it to the top of the genre." - Heavy metal (or simply metal) is a genre of rock music that developed in the late 1960s and early 1970s, largely in the United Kingdom and the United States. With roots in blues rock and psychedelic/acid rock, the bands that created heavy metal developed a thick, massive sound, characterized by highly amplified distortion, extended guitar solos, emphatic beats, and overall loudness. Heavy metal lyrics and performance styles are sometimes associated with aggression and machismo. Given the information above, choose from the list below the object entity that exhibits the relation 'instrument' with the subject 'andrew tompkins'. Choices: - cello - flute - guitar - viola - violin
A:
guitar