Question: In what Minnesota county was Jeff Nielsen born?

full_context: Document 1: Rochester, Minnesota: Rochester is a city in the U.S. State of Minnesota and is the county seat of Olmsted County. Located on the Zumbro River's south fork, the city has a population of 106,769 according to the 2010 United States Census. The U.S. Census Bureau estimated that the 2015 population was 112,225. It is Minnesota's third-largest city and the largest city located outside of the Minneapolis-St. Paul-Bloomington Metropolitan Statistical Area. As of 2015, the Rochester metropolitan area has a population of 213,873. It is the home of Mayo Clinic and one of IBM's largest facilities.
Document 2: Kirk Nielsen: Kirk G. Nielsen (born October 19, 1973) is a retired American professional ice hockey player. He played 6 games in the NHL with the Boston Bruins during the 1997–98 season. He is the younger brother of Jeff Nielsen.
Document 3: Brainerd, Minnesota: Brainerd is a city in Crow Wing County, Minnesota, United States. Its population was 13,592 as of the 2010 census. It is the county seat of Crow Wing County, and is one of the largest cities in Central Minnesota. Brainerd straddles the Mississippi River several miles upstream from its confluence with the Crow Wing River, having been founded as a site for a railroad crossing above said confluence. Brainerd is the principal city of the Brainerd Micropolitan Area, a micropolitan area covering Cass and Crow Wing counties and with a combined population of 91,067 as of the 2010 census. The Brainerd area serves as a major tourist destination for Minnesota, and Baxter is a regional retail center.
Document 4: Jannik Hansen: Jannik Hansen (15 March 1986) is a Danish professional ice hockey right winger currently playing for the San Jose Sharks of the National Hockey League (NHL). Hansen began playing professionally at the age of 16 with both the Rødovre Mighty Bulls of the Danish league and the Malmö Redhawks of the Swedish J20 SuperElit and HockeyAllsvenskan leagues. He played three seasons with Rødovre, during which time he was selected 287th overall by the Canucks in the 2004 NHL Entry Draft. A year after his selection, he moved to North America to play major junior hockey with the Portland Winterhawks of the Western Hockey League (WHL) for one season. In 2006–07, Hansen began playing with the Canucks' minor league affiliate, the Manitoba Moose of the American Hockey League (AHL). That season, he was called up by the Vancouver Canucks and became the first Danish citizen to play and register a point in an NHL playoff game. After another campaign spent primarily with Manitoba, Hansen earned a full-time roster spot with the Canucks.
Document 5: Grand Forks, North Dakota: Grand Forks is the third-largest city in the State of North Dakota (after Fargo and Bismarck) and is the county seat of Grand Forks County. According to the 2010 census, the city's population was 52,838, while the total of the city and surrounding metropolitan area was 98,461. Grand Forks, along with its twin city of East Grand Forks, Minnesota, forms the center of the "Grand Forks, ND-MN Metropolitan Statistical Area," which is often called "Greater Grand Forks" or "The Grand Cities".
Document 6: Grand Rapids, Minnesota: Grand Rapids is a city in Itasca County, Minnesota, United States. The population was 10,869 at the 2010 census. It is the county seat of Itasca County.
Document 7: Grand Rapids, Michigan: Grand Rapids is the second-largest city in Michigan, and the largest city in West Michigan. It is on the Grand River about 30 mi east of Lake Michigan. As of the 2010 census, the city population was 188,040. In 2010, the Grand Rapids metropolitan area had a population of 1,005,648, and the combined statistical area of Grand Rapids-Muskegon-Holland had a population of 1,321,557. Grand Rapids is the county seat of Kent County.
Document 8: Jeff Nielsen: Jeffrey Michael Nielsen (born September 20, 1971 in Grand Rapids, Minnesota) is a retired American professional ice hockey player who played in the NHL with the New York Rangers, Anaheim Mighty Ducks, and Minnesota Wild. He is the older brother of Kirk Nielsen.
Document 9: Greater Grand Forks: "Greater Grand Forks" (officially the Grand Forks, ND-MN Metropolitan Statistical Area) is the name used by some people to designate the twin cities of Grand Forks, North Dakota and East Grand Forks, Minnesota, together with their surrounding areas. The two cities lie directly across from each other on both sides of the Red River of the North, but Grand Forks, with a population of 52,838, is more than five times larger than East Grand Forks, with a population of 8,601. The metropolitan area includes all of the related two counties in the two states: Grand Forks County in North Dakota and Polk County in Minnesota. As of the 2010 census, the MSA had a population of 98,461, and in 2014 estimates placed the total population at 101,842.
Document 10: Nick Ritchie: Nicholas Ritchie (born December 5, 1995) is a Canadian professional ice hockey forward currently playing with the Anaheim Ducks in the National Hockey League (NHL). Ritchie was selected by the Ducks in the first round (10th overall) of the 2014 NHL Entry Draft. His older brother, Brett Ritchie, was drafted by the Dallas Stars in the 2011 NHL Entry Draft.
Document 11: Minnetonka, Minnesota: Minnetonka ( ) is a suburban city in Hennepin County, Minnesota, United States, eight miles (13 km) west of Minneapolis. The population was 49,734 at the 2010 census. The name comes from the Dakota Indian "mni tanka", meaning "great water". The city is the home of Cargill, the country's largest privately owned company, and United Healthcare, the state's largest publicly owned company.
Document 12: Sean Pronger: Sean James Pronger (born November 30, 1972) is a Canadian former professional ice-hockey player who grew up in Dryden, Ontario, and played in the National Hockey League from 1995 to 2004. He played for the following teams: Mighty Ducks of Anaheim, Pittsburgh Penguins, New York Rangers, Los Angeles Kings, Boston Bruins, Columbus Blue Jackets and Vancouver Canucks, having been drafted 51st overall by Vancouver in 1991. In 260 regular-season games, he scored 23 goals and 36 assists for 59 points, picking up 159 penalty minutes. He is the older brother of Chris Pronger.
Document 13: Neal Broten: Neal LaMoy Broten (born November 29, 1959) is a retired American professional ice hockey player. A member of the 1980 US Olympic hockey team that won the gold medal at Lake Placid in 1980, Broten was inducted into the US Hockey Hall of Fame in 2000 having appeared in 1,099 NHL regular season games from 1981 to 1997 with the Minnesota North Stars, Dallas Stars, New Jersey Devils and Los Angeles Kings. He is the older brother of Aaron and Paul Broten.
Document 14: Jeffrey Vanderbeek: Jeffrey "Jeff" Vanderbeek is the former owner of the New Jersey Devils, a professional ice hockey team in the National Hockey League. Vanderbeek, a New Jersey native and Devils season ticket holder since the late 1980s, bought a minority stake in the Devils when Puck Holdings, an affiliate of YankeeNets, purchased the team in 2000. In 2004, he bought the team outright and resigned his position as an executive vice president of Lehman Brothers, which he joined in 1984. He was ranked the ninth highest paid executive of 2002 by "Business Week" with pay totaling over $29 million. Vanderbeek has been a strong proponent of the Prudential Center, which hosted its first New Jersey Devils hockey game on October 27, 2007. He resides in Warren Township, New Jersey, having previously resided in South Orange, New Jersey.
Document 15: Michael Sauer (ice hockey): Michael Curtis "Mike" Sauer (born August 7, 1987) is an American former professional ice hockey defenseman who played three seasons in the National Hockey League (NHL) with the New York Rangers. He is the younger brother of Phoenix Coyotes defenseman Kurt Sauer, and of former Atlanta Falcons and Minnesota Vikings (NFL) linebacker Craig Sauer. Sauer was born in St. Cloud, Minnesota, but grew up in Sartell, Minnesota.
ground_truth: Itasca County