Question: Which high school was opened in 2015 in the second most populous city of Leavenworth County, Kansas?

Context paragraphs:
Lansing High School (Kansas): Lansing High School was opened in 2015 in Lansing, Kansas, United States.  It is part of Lansing Unified School District and is located at 1412 147th St .

Lawrence USD 497: Lawrence Unified School District 497, commonly referred to as USD 497 or Lawrence Public Schools, is the governing body of the Lawrence, Kansas public school system.  It was organized in 1965 and currently serves approximately 11,000 students from pre-Kindergarten to grade 12 and maintains 15 elementary schools, four middle schools, two high schools, a K–8 virtual school, a virtual high school, an adult learning center and a diploma-completion program.  The district covers most of north central Douglas County, a small portion of Leavenworth County and a few square miles of Jefferson County.

Leavenworth County, Kansas: Leavenworth County (county code LV) is a county located in the U.S. state of Kansas.  As of the 2010 census, the county population was 76,227.  Its county seat and most populous city is Leavenworth.

Lansing USD 469: Lansing Schools USD 469 is a public school district located in Lansing, Kansas, United States.  It is in Leavenworth County in the northeastern portion of the state, part of the Kansas City Metropolitan Area.

Centennial Bridge (Leavenworth, Kansas): The Centennial Bridge is a through arch bridge road bridge over the Missouri River connecting Leavenworth, Kansas and Platte County, Missouri.  Constructed in 1955, it was initially a toll bridge.  The bridge opened in 1955, a year after Leavenworth celebrated its centennial as the first city incorporated in Kansas.  It is a two-span arch bridge connecting K-92 and Missouri Route 92.  Its main span is 419.8 feet with a total length of 2,571.2 feet.  During the construction a spur of Route 45 called the "Leavenworth cutoff" was built to speed traffic to Kansas City, Missouri.  The two-mile spur, even though it is in Missouri was maintained by the city of Leavenworth until the tolls were removed from the Centennial Bridge in May 1977.  This is now maintained by MODOT.

Lansing, Kansas: Lansing is a city situated along the Missouri River in the eastern part of Leavenworth County, located in northeast Kansas, in the Central United States.  As of the 2010 census, the city population was 11,265.  It is the second most populous city of Leavenworth County and is a part of the Kansas City metropolitan area.

Sherman Army Airfield: Sherman Army Airfield (IATA: FLV, ICAO: KFLV) is an airport located at Fort Leavenworth, Kansas, in Leavenworth County, Kansas.  Although the airport is within the confines of a United States Army Post, it has agreement with the city of Leavenworth, Kansas to permit civilian use at all hours.

Fort Leavenworth: Fort Leavenworth is a United States Army installation located in Leavenworth County, Kansas, immediately north of the city of Leavenworth, in the upper northeast portion of the state.  Built in 1827, it is the oldest active United States Army post west of Washington, DC, and the oldest permanent settlement in Kansas.  Fort Leavenworth has been historically known as the "Intellectual Center of the Army."

Leavenworth, Kansas: Leavenworth is the largest city in and the county seat of Leavenworth County, Kansas, United States.  As of the 2010 census, the city population was 35,251.  Located on the west bank of the Missouri River 25 mi northwest of Kansas City, Missouri, it is part of the Kansas City metropolitan area.

Ernest Fox Nichols: Ernest Fox Nichols (June 1, 1869 – April 29, 1924) was an American educator and physicist.  He was born in Leavenworth County, Kansas, and received his undergraduate degree from Kansas State University in 1888.  After working for a year in the Chemistry Department at Kansas State, he matriculated to graduate school at Cornell University, where he received degrees in 1893 and 1897.  He also studied at the University of Berlin and Cambridge University.

Supporting paragraphs: Lansing High School (Kansas) Lansing, Kansas
Answer: Lansing High School