Question: What is the name of a National Preserve located in the Flint Hills region of Kansas and is home to a population of genetically pure American bison?
Context: The National Bison Range (NBR) is a National Wildlife Refuge located in western Montana established in 1908 to provide a sanctuary for the American bison.  The NBR is one of the oldest National Wildlife Refuges in the United States.  The size of the bison herd at the NBR is relatively small, numbering between 350 and 500 individuals.  The initial herd of American bison was provided by organizations such as the American Bison Society, and today the refuge serves as the central point for bison research in the United States. Noatak National Preserve is a United States National Preserve in northwestern Alaska that was established to protect the Noatak River Basin.  The Noatak River system, located just north of the Arctic Circle, is thought to be the last remaining complete river system in the United States that has not been altered by human activities.  The roadless basin was proclaimed a United States National Monument in 1978 and a National Preserve in 1980 through the passage of the Alaska National Interest Lands Conservation Act (ANILCA).  Noatak National Preserve borders Kobuk Valley National Park on the south and borders Gates of the Arctic National Park on the east.  Unlike the national parks that it borders, sport hunting is allowed in Noatak National Preserve. The Tallgrass Prairie bison herd is a population of genetically pure American bison ("Bison bison") inhabiting the Tallgrass Prairie National Preserve in central Kansas. Konza Prairie biosphere reserve is a biosphere reserve located in the Flint Hills region of north-eastern Kansas, approximately 10 km south of the city of Manhattan.  The Flint Hills are steep-sloped and overlain by shallow limestone soils unsuitable for cultivation.  This region contains the largest remaining area of tallgrass prairie in North America since the majority of the Konza Prairie and the surrounding landscape have not been ploughed. The Wind Cave bison herd is a herd of 250–400 American bison in Wind Cave National Park, South Dakota, USA.  It is believed to be one of only four free roaming and genetically pure herds on public lands in North America.  The other three herds are the Yellowstone Park bison herd, the Henry Mountains bison herd in Central Utah, and at Elk Island National Park in Alberta, Canada.  The Wind Cave herd are of the Plains bison subspecies ("Bison bison bison"). Little River Canyon National Preserve is a United States National Preserve located on top of Lookout Mountain near Fort Payne, Alabama, and DeSoto State Park.  Created by an act of Congress in 1992, the 15,288 acre preserve protects what is sometimes said to be the nation's longest mountaintop river, the Little River.  The canyon was historically called "May's Gulf", "gulf" being a common term throughout the Cumberland Plateau for this sort of feature (e.g. Savage Gulf in Tennessee, or Trenton Gulf nearby in Georgia, now renamed "Cloudland Canyon").  Prior to being assigned to the National Park Service, the canyon area formed the southmost unit of Alabama's DeSoto State Park. Big Cypress National Preserve is a United States National Preserve located in southern Florida, about 45 miles (72 kilometers) west of Miami.  The 720000 acre Big Cypress, along with Big Thicket National Preserve in Texas, became the first national preserves in the United States National Park System when they were established on October 11, 1974.  In 2008, Florida film producer Elam Stoltzfus featured the preserve in a PBS documentary. Tallgrass Prairie National Preserve is a United States National Preserve located in the Flint Hills region of Kansas, north of Strong City.  The preserve protects a nationally significant example of the once vast tallgrass prairie ecosystem.  Of the 400,000 square miles (1,000,000 km) of tallgrass prairie that once covered the North American continent, less than 4% remains, primarily in the Flint Hills.  Since 2009, the preserve has been home to the growing Tallgrass Prairie bison herd. The Henry Mountains bison herd, numbering 250 to 400 bison, is one of only four free roaming and genetically pure herds on public lands in North America.  The other three herds are the Yellowstone Park bison herd which was the ancestral herd for the Henry Mountains animals, the Wind Cave bison herd in South Dakota and the herd on Elk Island in Alberta, Canada. Mojave National Preserve is a United States National Preserve located in the Mojave Desert of San Bernardino County, California, USA, between Interstate 15 and Interstate 40.  The preserve was established October 31, 1994 with the passage of the California Desert Protection Act by the US Congress.  Previously, it was the East Mojave National Scenic Area, under the jurisdiction of the Bureau of Land Management.  Mojave National Preserve is vast.  At 1,600,000 acres (650,000 ha), it is the third largest unit of the National Park System in the contiguous United States.
Answer: Tallgrass Prairie National Preserve