In this task, you are given a set of context paragraphs, some supporting facts and an answer of a question. Your task is to generate question for given answer based on set of context paragraphs, supporting facts and an answer.

Let me give you an example: Context_1 : Charles Edward Ives ( ; October 20, 1874May 19, 1954) was an American modernist composer. He is one of the first American composers of international renown, though his music was largely ignored during his life, and many of his works went unperformed for many years. Over time, he came to be regarded as an "American original". He combined the American popular and church-music traditions of his youth with European art music, and was among the first composers to engage in a systematic program of experimental music, with musical techniques including polytonality, polyrhythm, tone clusters, aleatory elements, and quarter tones, foreshadowing many musical innovations of the 20th century. Context_2 : Daniel Evan Freeman (born 27 April 1959) is an American musicologist who specializes in European art music of the eighteenth century, in particular the musical culture of eighteenth-century Prague and the Bohemian lands. He is also active as a pianist and music editor. Context_3 : Art music (also known as Western classical music, cultivated music, serious music, canonic music, and more flippantly, real music or normal music) is an umbrella term that refers to musical traditions, implying advanced structural and theoretical considerations and a written musical tradition. "Serious" or "cultivated" music are terms frequently used as a contrast for ordinary, everyday music (popular and folk music, also called "vernacular music"). After the 20th century, art music was divided into two extensions: "serious music" and "light music". Context_4 : In the history of European art music, the term "common practice period" refers to the era between the formation and the dissolution of the tonal system. Though there are no exact dates for this phenomenon, most features of the common-practice period persisted from the mid to late baroque period, through the Classical and Romantic periods, or roughly from around 1650 to 1900. While certain prevailing patterns and conventions characterize the music of this period, the time period also saw considerable stylistic evolution. Some conventions evolved during this period that were rarely employed at other times during what may still be labeled "common practice" (for example, Sonata Form). Thus, the dates 16501900 are necessarily nebulous and arbitrary borders that depend on context. The most important unifying feature through this time period concerns a harmonic language to which modern music theorists can apply Roman numeral analysis. Context_5 : The Festival Oude Muziek Utrecht ("Utrecht Early Music Festival") is an annual music festival that showcases and celebrates early European art music. The ten-day festival takes place in the Dutch city of Utrecht, and begins in August. The programme comprises concerts, activities, lectures, exhibitions, and a symposium. Context_6 : Assaf Shelleg (Hebrew: ), is a musicologist and pianist, a senior lecturer of musicology at The Hebrew University of Jerusalem. He was previously the Schusterman Visiting Assistant Professor of Musicology and Jewish Studies in the Department of Religious Studies at the University of Virginia (201114), and had taught prior to that as the visiting Efroymson Scholar in the Jewish, Islamic & Near Eastern Languages and Cultures Department at Washington University in St. Louis (200911). Shelleg specializes in twentieth-century Jewish and Israeli art music and has published in some of the leading journals in both musicology and Israel Studies on topics ranging from the historiography of modern Jewish art music to the theological networks of Israeli art music. Shelleg's book, "Jewish Contiguities and the Soundtrack of Israeli History", appeared in November 2014 with Oxford University Press. The book studies the emergence of modern Jewish art music in central and Western Europe (1910s-1930s) and its translocation to Palestine/Israel (1930s-1970s), exposing the legacies of European antisemitism and religious Judaism in the making of Israeli art music. Moving to consider the dislocation of modern Jewish art music the book examines the paradoxes embedded in a Zionist national culture whose rhetoric negated its pasts, only to mask process of hybridizations enchained by older legacies. "Jewish Contiguities" has won the 2015 Engle Prize for the study of Hebrew Music, and the 2016 Jordan Schnitzer Book Award. Context_7 : Vocal harmony is a style of vocal music in which a consonant note or notes are simultaneously sung as a main melody in a predominantly homophonic texture. Vocal harmonies are used in many subgenres of European art music, including Classical choral music and opera and in the popular styles from many Western cultures ranging from folk songs and musical theater pieces to rock ballads. In the simplest style of vocal harmony, the main vocal melody is supported by a single backup vocal line, either at a pitch which is above or below the main vocal line, often in thirds or sixths which fit in with the chord progression used in the song. In more complex vocal harmony arrangements, different backup singers may sing two or even three other notes at the same time as each of the main melody notes, mostly with consonant, pleasing-sounding thirds, sixths, and fifths (although dissonant notes may be used as short passing notes). Context_8 : David Wallis Reeves (February 14, 1838 March 8, 1900), also known as D. W. Reeves or Wally Reeves, was an American composer, cornetist, and bandleader. He developed the American march style, later made famous by the likes of John Philip Sousa, and his innovations include adding a countermelody to the American march form in 1876. Sousa called Reeves "The Father of Band Music in America", and stated he wished he himself had written Reeves' "Second Regiment Connecticut National Guard March". Charles Ives also borrowed from the "Second Connecticut" on four occasions. Context_9 : "Indian classical music is one of many forms of art music that have their roots in particular regional cultures. For other "classical" and art music traditions, see List of classical and art music traditions." Context_10 : Progressive music is music that subverts genre and expands stylistic boundaries outwards. Rooted in the idea of a cultural alternative, musical progressiveness embodies a continuous move between explicit and implicit references to genres and strategies derived from various cultural domains, such as European art music, Celtic folk, West Indian, or African. The word "progressive" comes from the basic concept of "progress", which refers to development and growth by accumulation, and is often deployed in numerous music genres such as progressive country, progressive folk, progressive jazz, and (most significantly) progressive rock. fact_1 : Charles Ives also borrowed from the "Second Connecticut" on four occasions. fact_2 : Charles Edward Ives ( ; October 20, 1874May 19, 1954) was an American modernist composer. fact_3 : He combined the American popular and church-music traditions of his youth with European art music, and was among the first composers to engage in a systematic program of experimental music, with musical techniques including polytonality, polyrhythm, tone clusters, aleatory elements, and quarter tones, foreshadowing many musical innovations of the 20th century. Answer: 1874May
The answer to this example can be: What is the birthyear of the American composer that borrowed from "Second Connecticut" on four occasions and combined American popular and church-music traditions with European art music?
Here is why: From the fact_1 from context _8, and fact _2 and fact _3 from context _1, we can arrive at 1874 May which is accurate answer of generated question.

OK. solve this:
Context_1 : The BMW B57 engine is a straight-six cylinder turbodiesel engine produced by the automobile manufacturer BMW. Together with the B37 (three-cylinder diesel engine), the B47 (inline-4 cylinder diesel engine), and the three inline-4 and inline-6 petrol engines (B38 (three-cylinder), B48 (four-cylinder) and B58 (six-cylinder)), the B57 is one of the latest (as of 2017) modular engines from BMW. The modular motors are used in BMW models as well as in MINI models. The B57 replaced the N57 diesel engine family in the new 5-series and 7-series. This new engine is available in configurations with up to 4 turbochargers that operate in a double-series layout. Output is up to 400 horsepower and 569 lb-ft of torque. Context_2 : The Detroit Diesel Series 51 was a two-stroke diesel engine built by General Motors, Detroit Diesel Division from 1951 to 1959. Unlike other GM/Detroit Diesel engines, the 51 series designation did not refer to the cylinder displacement, but rather to the year it was introduced. Two versions were produced, an inline two-cylinder (2-51, 108 cid ) and an inline four-cylinder model (4-51, 216 cid ). This was accomplished by using loop scavenging ports for both intake and exhaust along with a mechanical blower. This engine used a dry sleeve with 9 intake ports and three exhaust ports in that sleeve. These sleeves were located in such a way that the exhaust ports lined up with exhaust ports in the block that were physically higher than the intake ports in the block. This resulted in pressurized cool air being forced through the intake ports just after the exhaust started exiting (note that the exhaust ports in the sleeves were higher at the top than the intake ports while the bottom of all ports in the sleeve are at the same height. The net compression ratio is 18:1. Unlike a two cycle gasoline engine, the crankcase was not used to draw in the fuel/air mixture. Instead, the blower forced air in the intake ports and fuel was injected by a camshaft actuated injector which was pressurized by a gear pump. As fuel is injected just before top dead center, little unburned fuel is expelled in the exhaust, unlike a two-cycle gasoline engine. The elimination of exhaust valves reduced the complexity and weight of the engine. The power output and RPM of this engine was controlled by governing the intake air and controlling the opening of the injectors with shutdown accomplished by completely closing off the air intake. The much lower weight of this engine compared to engines with valves made it quite suitable for applications where other engines of the same horsepower were not feasible. Its uses include: Marine propulsion, generators, pumps, air compressors, road graders and other industrial uses. It was never factory installed for automotive purposes but conversion kits and engines were made available for automotive use. This engine design did not see widespread use due to not being able to reduce the exhaust noise to an acceptable level, as any exhaust restriction would have resulted in a reduction of power and efficiency. It was a very fuel efficient engine with a high power output to fuel consumption ratio. Context_3 : The knucklehead is a retronym used by enthusiasts to refer to a Harley-Davidson motorcycle engine, so named because of the distinct shape of the rocker boxes. The engine is a two-cylinder, 45 degree, pushrod actuated overhead valve V-twin engine with two valves per cylinder. It was the third basic type of V-Twin engine used by Harley-Davidson, replacing the Flathead-engined VL model in 1936 as HD's top-of-the-line model. The engine was manufactured until 1947 and was replaced by the Panhead engine in 1948. The Knucklehead-engined models were originally referred to as "OHVs" by enthusiasts of the time and in Harley's official literature; the nickname arose from the California chopper culture of the late 1960s. Context_4 : EcoDiesel is an engine used in the Ram 1500 since 2014, as well as in the Jeep Grand Cherokee. Approximately 20% of 2015 RAM 1500s are equipped with the engine, mostly ones sold in Europe. FCA uses the EcoDiesel name for two different engines. One is the VM Motori A 630 DOHC 3.0L engine used in the Grand Cherokee, and Ram. The other is a Fiat 3.0L diesel used in the Ram ProMaster. Context_5 : The River Don Engine is a 1905-built steam engine used for hot rolling steel armour plate. It is a 3-cylinder simple engine of 40 in diameter, 48 in stroke. At its operating steam pressure of 160psi, it developed 12000 hp , and was able to reverse from full speed in 2 seconds. The rapid reverse was an essential feature of an engine used for rolling, as delays would result in cooling of the workpiece. This engine was one of four built to the same design, one going overseas to the Japanese Government, one to John Brown's Atlas plant, and the destination of the final one being William Beardmore of Glasgow. It is claimed to be one of the most powerful steam engines ever built, and the most powerful remaining in Europe. Context_6 : BMW B47 is a 2.0L four-cylinder common rail diesel engine from German car manufacturer BMW. It debuted in 2014 in the BMW X3 and replaced the previous N47 engine. Together with the B37 (three-cylinder diesel engine) and the B57 (inline six-cylinder diesel engine) and the three gasoline engines: B38 (three-cylinder), B48 (four-cylinder) and B58 (six-cylinder), the B47 is part of a family of modular engines from BMW introduced in 2013/2014. Context_7 : The straight-six engine or inline-six engine (often abbreviated I6 or L6) is an internal combustion engine with the cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft (straight engine). Context_8 : Non-road engine (which may include non-road equipment and non-road vehicle) is an internal combustion engine or a gas turbine engine used for other purposes than being an engine of a vehicle operated on public roadways. The term is commonly used by regulators to classify the engines in order to control their emission. Non-road engines are used in an extremely wide range of applications which may include machinery and engines of vehicles in other modes of transportation with different fuel types such as gasoline and diesel fuel. In many jurisdictions, the term non-road engine is assumed to refer to the engines that have mobility or portability which is separated from the term stationary engine. The definition of non-road engine may explicitly exclude certain non-road vehicles such as aircraft, locomotives, and ocean-going marine vessels. In Europe, the regulations are specifically clarified on the mobility by using the term non-road mobile machinery (NRMM). In Australia, the definition includes some stationary engines such as electric generators and pumps. Context_9 : The Honda Rafaga series CE4 and CE5 was a compact 4-door sedan sold only in Japan by Honda, introduced in January 1993, and used the same 5-cylinder engine that was used in the Honda Inspire and the Honda Vigor and shared a platform with the second generation CE series Honda Ascot. "Rafaga" is Spanish for "gust" or "blustery". The engine is installed longitudinally, the same configuration used in the Vigor and Inspire. The Rafaga was third in Hondas hierarchy of sedans, and a sister car to the Ascot, which was sold at the "Honda Primo" dealership network. The Rafaga was sold in Japan at "Honda Verno" dealerships, and was one level up from the Honda Integra. As with other Honda products, the Rafaga used double wishbone suspension at the front and rear wheels. The "2.5 S" trim level came with a front suspension upper strut brace in the engine compartment. In Japan, the smaller G20A engine used regular grade fuel, while the larger G25A engine used premium grade fuel. Context_10 : The HG-3 was a liquid-fuel cryogenic rocket engine which was designed for use on the upper stages of Saturn rockets in the post-Apollo era. Designed in the United States by Rocketdyne, the HG-3 was to have burned cryogenic liquid hydrogen and liquid oxygen propellants, with each engine producing 1400.7 kN of thrust during flight. The engine was designed to produce a specific impulse ("I") of 451 seconds in a vacuum, or 280 seconds at sea level. Developed from Rocketdyne's J-2 engine used on the S-II and S-IVB stages, the engine was intended to replace the J-2 on the upgraded S-II-2 and S-IVB-2 stages intended for use on the Saturn MLV, Saturn IB-B and Saturn V/4-260 rockets, with a sea-level optimised version, the HG-3-SL, intended for use on the Saturn INT-17. The engine was cancelled, however, during the post-Apollo drawdown when development of the more advanced Saturn rockets ceased, and never flew, although the engine was later used as the basis for the design of the RS-25 Space Shuttle main engine. fact_1 : The BMW B57 engine is a straight-six cylinder turbodiesel engine produced by the automobile manufacturer BMW. fact_2 : The straight-six engine or inline-six engine (often abbreviated I6 or L6) is an internal combustion engine with the cylinders mounted in a straight line along the crankcase with all the pistons driving a common crankshaft (straight engine). Answer: I6 or L6
Answer:
What is the abbreviation of the engine used by the BWW B57?