Please answer the following question: Information:  - The Oslo Metro (or or simply ) is the rapid transit system of Oslo, Norway, operated by Sporveien T-banen on contract from the transit authority Ruter. The network consists of five lines that all run through the city centre, with a total length of , serving 101 stations of which 17 are underground or indoors. In addition to serving 14 out of the 15 boroughs of Oslo (all except St. Hanshaugen), two lines run to Bærum. In 2015, the system had an annual ridership of 94.4 million.  - Lambertseter is a suburb of the city of Oslo, Norway, and is part of the borough of Nordstrand.  - Brattlikollen is a station on Lambertseter Line ( Line 4 ) of the Oslo Metro . The station is between Ryen and Karlsrud , 7.8 km ( 4.8 mi ) from Stortinget . The station was opened on 28 April 1957 as a tramway and on 22 May 1966 as a metro . The station 's architect was Edgar Smith Berentsen . The station is on the south side of Brannfjell . The neighborhood around the station is mainly residential with a mixture of detached houses and apartment buildings . Access to the station is from the local road Sandstuveien which passes below the line immediately south of the station .  - St. Hanshaugen (Norwegian for St. John's Hill) is a district of the city of Oslo, Norway.  - Bærum is a municipality in Akershus county, Norway. The administrative centre of the municipality is the town of Sandvika. Bærum was established as a municipality on 1 January 1838. A suburb of Oslo, Bærum is located on the west coast of the city.  - The Lambertseter Line is a line on the Oslo Metro which runs from Brynseng to Bergkrystallen. It further shares track with the Østensjø Line along the section from Tøyen to Brynseng. The line runs through a primary residential area of Nordstrand, serving neighborhoods such as Manglerud, Ryen and Lambertseter. The line is served by Line 4 of the metro, which runs every fifteen minutes. This is supplemented by Line 1 that is extended to Bergkrystallen between 6:30 and 19 on weekdays, giving a combined frequency of eight trains per hour.  - The Østensjø Line is a line on the Oslo Metro which runs from Brynseng to Mortensrud. It further shares track with the Lambertseter Line along the section from Tøyen to Brynseng. The line runs through the primary residential areas of Bøler, Østensjø and Søndre Nordstrand. The line is served by Line 3 of the metro.  - Ryen is a neighborhood in the borough Østensjø in Oslo, Norway. It is located north of the border to the borough Nordstrand.  - Rapid transit, also known as heavy rail, metro, subway, tube, or underground, is a type of high-capacity public transport generally found in urban areas. Unlike buses or trams, rapid transit systems are electric railways that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles of any sort, and which is often grade separated in tunnels or on elevated railways.  - Oslo is the capital and the most populous city in Norway. It constitutes both a county and a municipality. Founded in the year 1040, and established as a "kaupstad" or trading place in 1048 by Harald Hardrada, the city was elevated to a bishopric in 1070 and a capital under Haakon V of Norway around 1300. Personal unions with Denmark from 1397 to 1523 and again from 1536 to 1814 and with Sweden from 1814 to 1905 reduced its influence. After being destroyed by a fire in 1624, the city was moved closer to Akershus Fortress during the reign of Christian IV of Denmark and renamed Christiania in his honour. It was established as a municipality ("formannskapsdistrikt") on 1 January 1838. Following a spelling reform, it was known as Kristiania from 1877 to 1925, at which time its original Norwegian name was restored.  - Manglerud is a borough in the Østensjø district of Oslo, Norway. Manglerud was built in the 1960s as a suburb to Oslo, connected by the "Oslo T-bane" metro system.  - Ruter AS is the public transport authority for Oslo and Akershus counties in Norway. Formally a limited company  60% of the shares in which are owned by the Oslo county municipality and 40% by that of Akershus  it is responsible for administrating, funding, and marketing (but not operating) public transport in the two counties, including buses, the Oslo Metro ("T-banen i Oslo"), Oslo Trams ("Trikken i Oslo"), and ferry services. Ruter also holds agreements with the Norwegian State Railways concerning the regulation of fares on commuter train services operated within the two counties.  - Sporveien T-banen AS is a limited company that is responsible for operating Oslo Metro, the rapid transit in Oslo, Norway. The company is owned by Sporveien, which is owned by the city council. Sporveien operates on a contract with Ruter, the public transport administration in Oslo and Akershus.    After reading the paragraphs above, choose the best answer for the entity that related to 'brattlikollen ' with the relationship of 'located in the administrative territorial entity'.  Choices: - akershus  - bærum  - centre  - denmark  - district  - hill  - manglerud  - nordstrand  - norway  - of  - oslo  - søndre nordstrand  - west  - østensjø
A:
nordstrand