Information: - The American Locomotive Company, often shortened to ALCO, ALCo or Alco, designed, built and sold steam locomotives, diesel-electric locomotives, diesel engines and generators, specialized forgings, high quality steel, armed tanks and automobiles and produced nuclear energy. The American Locomotive Company was formed in 1901 by the merger of Schenectady Locomotive Engine Manufactory of Schenectady, New York with seven smaller locomotive manufacturers. - A steam locomotive is a railway locomotive that produces its pulling power through a steam engine. These locomotives are fueled by burning combustible materialusually coal/coke, wood, or oilto produce steam in a boiler. The steam moves reciprocating pistons which are mechanically connected to the locomotive's main wheels (drivers). Both fuel and water supplies are carried with the locomotive, either on the locomotive itself or in wagons (tenders) pulled behind. The first steam locomotive, made by Richard Trevithick, first operated on 21 February 1804, three years after the road locomotive he made in 1801. The first practical steam locomotive was built in 1812-13 by John Blenkinsop. - The diesel engine (correctly known as a compression-ignition or CI engine) is an internal combustion engine in which ignition of the fuel that has been injected into the combustion chamber is caused by the high temperature which a gas achieves (i.e. the air) when greatly compressed (adiabatic compression). Diesel engines work by compressing only the air. This increases the air temperature inside the cylinder to such a high degree that it ignites atomised diesel fuel that is injected into the combustion chamber. This contrasts with spark-ignition engines such as a petrol engine (gasoline engine) or gas engine (using a gaseous fuel as opposed to petrol), which use a spark plug to ignite an air-fuel mixture. In compression-ignition engines, glow plugs (combustion chamber pre-warmers) may be used to aid starting in cold weather, or when the engine uses a lower compression-ratio, or both. The original compression-ignition engine operates on the "constant pressure" cycle of gradual combustion and produces no audible knock. - The Milwaukee Road Class A was a class of high - speed , streamlined 4 - 4 - 2 '' Atlantic '' type steam locomotives built by the American Locomotive Company in 1935 - 37 to haul the Milwaukee Road 's Hiawatha express passenger trains . Numbered from # 1 - # 4 , they were among the last Atlantic type locomotives built in the United States , and certainly the largest and most powerful . The class were the first locomotives in the world built for daily operation at over 100 mph ( 160 km / h ) , and the first class built completely streamlined , bearing their casings their entire lives . Although partially supplanted by the larger F7 '' Hudsons '' from 1937 , they remained in top - flight service until the end . Locomotive # 3 was taken out of service in 1949 and cannibalised for spares to keep the other three running until 1951 . None survived into preservation . Given the information above, choose from the list below the object entity that exhibits the relation 'powerplant' with the subject 'milwaukee road class a'. Choices: - diesel engine - internal combustion engine - steam engine
steam engine

*Question*
Information: - Plant Tycoon is a life simulation game about the breeding and growing of plants , published by independent developer Last Day of Work . - Last Day of Work (LDW) is an independent game studio specializing in sophisticated casual games for the mainstream player. Since 2004, the company has lovingly crafted several highly successful real-time "Virtual Life" simulation games including Fish Tycoon ©️, Plant Tycoon ©️, Virtual Families ©️ and the Virtual Villagers ©️ series for platforms including PC, Mac, iPhone/iPod touch, Palm OS and Windows Mobile Pocket PC. LDW's games are easy to pick up and play, while at the same time providing more in-depth and complex gameplay than the typical casual game. Based in San Francisco, California, Last Day of Work was founded by CEO Arthur Humphrey who, along with his wife and LDW Executive Producer Carla, puts a great deal of nurturing into developing and publishing thoughtful games for casual audiences. - San Francisco (SF) (Spanish for Saint Francis) officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. It is the birthplace of the United Nations. Located at the north end of the San Francisco Peninsula, San Francisco is about in area, making it the smallest countyand the only consolidated city-countywithin the state of California. With a density of about 18,451 people per square mile (7,124 people per km), San Francisco is the most densely settled large city (population greater than 200,000) in California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego, and San Jose, and the 13th-most populous city in the United Stateswith a census-estimated 2015 population of 864,816. The city and its surrounding areas are known as the San Francisco Bay Area, and are a part of the larger OMB-designated San Jose-San Francisco-Oakland combined statistical area, the fifth most populous in the nation with an estimated population of 8.7 million. - A simulation video game describes a diverse super-category of video games, generally designed to closely simulate aspects of a real or fictional reality. - California is the most populous state in the United States and the third most extensive by area. Located on the western (Pacific Ocean) coast of the U.S., California is bordered by the other U.S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. The state capital is Sacramento. Los Angeles is California's most populous city, and the country's second largest after New York City. The state also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County. - Life simulation (or artificial life games) is a subgenre of simulation video games in which the player lives or controls one or more virtual lifeforms. A life simulation game can revolve around "individuals and relationships, or it could be a simulation of an ecosystem". Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'plant tycoon'. Choices: - area - census - city - company - country - day - fish - game - iphone - large city - los angeles - nation - ocean - part - people - plant - play - publishing - saint - simulation - square - state - studio - video - video game - work
**Answer**
video game