Please answer the following question: Information: - Denver is the central city of a conurbation region in the U.S. state of Colorado. The conurbation includes one continuous region consisting of the six central counties of Adams, Arapahoe, Broomfield, Denver, Douglas and Jefferson. The Denver region is part of the Front Range Urban Corridor. - The 2010 United States Census, (known as "Census 2010"), is the twenty-third and currently most recent United States national census. National Census Day, the reference day used for the census, was April 1, 2010. As part of a drive to increase the count's accuracy, 635,000 temporary enumerators were hired. The population of the United States was counted as 308,745,538, a 9.7% increase from the 2000 Census. - The Southwestern United States (also known as the American Southwest) is a region of the United States which includes Arizona, the western portion of New Mexico, bordered on the east by the Llano Estacado, southern Colorado and Utah below the 39th parallel, the "horn" of Texas below New Mexico, the southernmost triangle of Nevada, and the most southeastern portion of California, which encompasses the Mojave and Colorado Deserts. - Denver, officially the City and County of Denver, is the capital and most populous municipality of the U.S. state of Colorado. Denver is located in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains. The Denver downtown district is located immediately east of the confluence of Cherry Creek with the South Platte River, approximately east of the foothills of the Rocky Mountains. Denver is nicknamed the "Mile-High City" because its official elevation is exactly one mile above sea level, making it one of the highest major cities in the United States. The 105th meridian west of Greenwich, the longitudinal reference for the Mountain Time Zone, passes directly through Denver Union Station. Denver is ranked as a Beta- world city by the Globalization and World Cities Research Network. With a 2015 estimated population of 682,545, Denver ranks as the 19th-most populous U.S. city, and with a 2.8% increase in 2015, the city is also the fastest growing major city in the United States. The 10-county Denver-Aurora-Lakewood, CO Metropolitan Statistical Area had an estimated 2015 population of 2,814,330 and ranked as the 19th most populous U.S. metropolitan statistical area. The 12-city Denver-Aurora, CO Combined Statistical Area had an estimated 2015 population of 3,418,876, which ranks as the 16th most populous U.S. metropolitan area. Denver is the most populous city of the 18-county Front Range Urban Corridor, an oblong urban region stretching across two states with an estimated 2015 population of 4,757,713. Denver is the most populous city within a radius and the second-most populous city in the Mountain West after Phoenix, Arizona. In 2016, Denver was named the best place to live in the USA by U.S. News & World Report. - A U.S. state is a constituent political entity of the United States of America. There are 50 states, which are bound together in a union with each other. Each state holds administrative jurisdiction over a defined geographic territory, and shares its sovereignty with the United States federal government. Due to the shared sovereignty between each state and the federal government, Americans are citizens of both the federal republic and of the state in which they reside. State citizenship and residency are flexible, and no government approval is required to move between states, except for persons covered by certain types of court orders (e.g., paroled convicts and children of divorced spouses who are sharing custody). - The Rocky Mountains, commonly known as the Rockies, are a major mountain range in western North America. The Rocky Mountains stretch more than from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States. Within the North American Cordillera, the Rockies are somewhat distinct from the Pacific Coast Ranges and the Cascade Range and Sierra Nevada which all lie further to the west. - The Southern Rocky Mountains are a major subregion of the Rocky Mountains of North America located in the southeastern portion of the U.S. state of Wyoming, the central and western portions of Colorado, the northern portion of New Mexico, and extreme eastern portions of Utah. The Southern Rocky Mountains are also commonly known as the Southern Rockies, and since the highest peaks are located in the State of Colorado, they are sometimes known as the Colorado Rockies, although many important ranges and peaks rise in the other three states. The Southern Rockies include the highest mountain ranges of the Rocky Mountains and include all 30 of the highest major peaks of the Rockies. - The Front Range is a mountain range of the Southern Rocky Mountains of North America located in the central portion of the U.S. State of Colorado, and southeastern portion of the U.S. State of Wyoming. It is the first mountain range encountered moving west along the 40th parallel north across the Great Plains of North America. The Front Range runs north-south between Casper, Wyoming and Pueblo, Colorado and rises nearly 10,000 feet above the Great Plains. Longs Peak, Mount Evans, and Pikes Peak are its most prominent peaks, visible from the Interstate 25 corridor. The area is a popular destination for mountain biking, hiking, climbing, and camping during the warmer months and for skiing and snowboarding during winter. Millions of years ago the present-day Front Range was home to ancient mountain ranges, deserts, beaches, and even oceans. - The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. The province covers an area of 337,000km (130,000mi) within western Colorado, northwestern New Mexico, southern and eastern Utah, and northern Arizona. About 90% of the area is drained by the Colorado River and its main tributaries: the Green, San Juan, and Little Colorado. Most of the remainder of the plateau is drained by the Rio Grande and its tributaries. - A conurbation is a region comprising a number of cities, large towns, and other urban areas that, through population growth and physical expansion, have merged to form one continuous urban or industrially developed area. In most cases, a conurbation is a polycentric urbanised area, in which transportation has developed to link areas to create a single urban labour market or travel to work area. - The United States Census Bureau (USCB; officially the Bureau of the Census, as defined in Title ) is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy. - The Great Plains is the broad expanse of flat land (a plain), much of it covered in prairie, steppe and grassland, that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the United States and Canada. This area covers parts, but not all, of the states of Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming, Minnesota, Iowa and the Canadian provinces of Alberta, Manitoba and Saskatchewan. The region is known for supporting extensive cattle ranching and dry farming. - The Western United States, commonly referred to as the American West, the Far West, or simply the West, traditionally refers to the region comprising the westernmost states of the United States. Because European settlement in the U.S. expanded westward after its founding, the meaning of the West has evolved over time. Prior to about 1800, the crest of the Appalachian Mountains was seen as the western frontier. - Golden Gate Canyon State Park is a Colorado State Park located in Gilpin and Jefferson counties northwest of Golden, Colorado. The Front Range park established in 1960 has of hiking trails. Horse and bicycle travel is allowed on . Facilities include a visitors center, over 100 campsites and over 100 picnic sites. - Colorado is a state in the United States encompassing most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is part of the Western United States, the Southwestern United States, and the Mountain States. Colorado is the 8th most extensive and the 22nd most populous of the 50 United States. The United States Census Bureau estimates that the population of Colorado was 5,456,574 on July 1, 2015, an increase of 8.50% since the 2010 United States Census. - Ralston Creek is a tributary of Clear Creek , approximately 32 miles ( 51 km ) long , in central Colorado in the United States . It drains a suburban and urban area of the northwestern Denver Metropolitan Area . It rises in the foothills in northeastern Gilpin County , in southern Golden Gate Canyon State Park . It descends through a valley eastward into Jefferson , following Drew Hill Road ( County Road 57 ) , emerging from the mountains approximately 3 miles ( 5 km ) north of Golden , where it is impounded to form Ralston Reservoir and Arvada / Blunn Reservoir on both sides of State Highway 93 . It flows eastward through Arvada and joins Clear Creek from the north in southeast Arvada , near the intersection of Sheridan Avenue and Interstate 76 . After reading the paragraphs above, choose the best answer for the entity that related to 'ralston creek ' with the relationship of 'instance of'. Choices: - 12 - 25 - agency - april - area - bicycle - canyon - census - city - coast - confluence - conurbation - cordillera - count - day - economy - federal republic - front - frontier - gate - grassland - horse - jurisdiction - market - meridian - metropolitan - mountain - municipality - news - number - park - phoenix - plain - plateau - population - principal - province - range - reference - region - river - sea - settlement - sharing - sierra nevada - single - skiing - state - state park - station - steppe - subregion - three - time - title - triangle - two - valley - work
Answer:
river