Question: How many league titles has the Norwegian professional football club for which Jan Christiansen played in Trondheim won?

Context paragraphs:
Cairnlea FC: Cairnlea FC is a football (soccer) club based in Cairnlea, Victoria, Australia.  The club was formerly known as the Albion Rovers Soccer Club which was formed by the amalgamation of Royal Park Soccer Club and Albion Rovers Soccer Club in 1982.  Since this time, the club has enjoyed success playing at the highest levels in Victorian football including finals campaigns in the Victorian Premier League (VPL), a host of Victorian State League titles and many League Cups.  A combined five league titles between the Men and Women's team have given the club the most successful record of any Turkish backed club in Australian history.  Currently the club's Senior Men team play in the Victorian State League Division 2 N/W competition.

Celtic F.C.: The Celtic Football Club ( ) is a professional football club based in Glasgow, Scotland, which plays in the Scottish Premiership.  The club was founded in 1887 with the purpose of alleviating poverty in the immigrant Irish population in the East End of Glasgow.  They played their first match in May 1888, a friendly match against Rangers which Celtic won 5–2.  Celtic established itself within Scottish football, winning six successive league titles during the first decade of the 20th century.  The club enjoyed their greatest successes during the 1960s and 70s under Jock Stein when they won nine consecutive league titles and the European Cup.

Seongnam FC: Seongnam FC (Korean: 성남 FC ) is a South Korean professional football club, based in Seongnam, South Korea.  Seongnam currently plays in the K League Challenge.  Founded as Ilhwa Chunma Football Club in 1989, the club is the most successful in Korean football, having won a record seven K league titles, three FA Cups, three League Cups, and two AFC Champions League titles.

Dynamos F.C.: Dynamos Football Club (also referred to simply as Dynamos, or, outside of Zimbabwe, as Dynamos Harare or Zimbabwe Dynamos) is a Zimbabwean professional football club based since 1963 at Rufaro Stadium, Mbare, Harare.  The team currently participates in Zimbabwe's top-tier, the Premier Soccer League.  Founded in 1963 after a merger between two lesser teams in Mbare, Harare Township, Rhodesia, the side quickly became one of the strongest in the Rhodesian league, and by the recognition of the country's independence as Zimbabwe in 1980 had become the country's most successful team, having won six national titles.  Dynamos have won a record 22 league titles and 16 cup titles.

FK Sarajevo: Fudbalski klub Sarajevo (English: Sarajevo Football Club ) is a Bosnian professional football club based in Sarajevo, the capital city of Bosnia and Herzegovina and is one of the most successful clubs in the country.  Founded on 24 October 1946, FK Sarajevo was the most successful club from SR Bosnia in former SFR Yugoslavia, winning two Yugoslav First League titles, being runners-up on two other occasions and finishing 6th in that competition's all-time table.  The club's official colours are maroon and white.  FK Sarajevo was the only major football club founded by the post-war Yugoslav authorities in the city of Sarajevo.  The club entered the Yugoslav First League in the 1948–49 season, and eventually competed in all but two seasons in the top tier.  After Bosnia and Herzegovina gained independence from Yugoslavia, FK Sarajevo became one the country's biggest ambassadors, departing on a large world tour during the Bosnian war with the goal of gaining international support for the country's cause.

List of Molde FK players: Molde Fotballklubb, also known simply as Molde FK, is a Norwegian professional football club based in Molde.  The club is affiliated with Nordmøre og Romsdal Fotballkrets and play their home games at Aker Stadion.  Formed on 19 June 1911, the club have won one national league title and two national cup titles.  Molde participated in the UEFA Champions League in 1999 where they met Real Madrid, Porto and Olympiacos in the group stage.  This made them the second Norwegian football club, to have reached the group stage of the competition.  Currently playing in Tippeligaen, where the season lasts from March to November, the club are the reigning champions after winning their first championship in 2011.  Molde also had a successful period from 1994 to 2005, when they won their two Norwegian Cup titles, and finished second in the league on four occasions.

Tromsø IL: Tromsø Idrettslag is a Norwegian professional football club founded in 1920, based in the city of Tromsø.  They play their home games at Alfheim Stadion.  Tromsø currently play in the Tippeligaen and holds the position as the northernmost top-level football club in the world.  The club was first promoted to the Norwegian Premier League in 1985, where they have played since with the exception of the 2001 and 2014 seasons which were spent in the First Division.

Rosenborg BK: Rosenborg Ballklub, commonly referred to simply as Rosenborg (] ) or (especially locally) RBK, is a Norwegian professional football club from Trondheim that plays in the Eliteserien. The club have won a record 24 league titles, eleven Norwegian Football Cup titles and have played more UEFA matches than any other Norwegian team.  RBK play their home games at the all-seater Lerkendal Stadion which has a capacity of 21,400.  Kåre Ingebrigtsen was appointed head coach in July 2014.

Jan Christiansen: Jan Clifford Christiansen (born 8 April 1941) is a Norwegian former football player and coach.  He played for Rosenborg BK in Trondheim from 1966 to 1975, earning three league titles and one cup championship.  Christiansen was capped 13 times for Norway national football team.  Christiansen coached Rosenborg BK in the 1975 season.

Viking FK: Viking Fotballklubb (most often called Viking, sometimes Viking Stavanger internationally) is a Norwegian football club from the city of Stavanger.  The club was founded in 1899.  It is one of the most successful clubs in Norwegian football, having won 8 Norwegian Premier League titles, most recently in 1991, and 5 domestic Norwegian Cup titles, most recently in 2001.  The club has played and won more top-flight league games than any other club, and it has played in the top division since the league was established, except for the years 1966–67 and 1987–88.  Notable European successes include knocking English side Chelsea out of the UEFA Cup during the 2002–03 season, knocking out Sporting CP from the same tournament in 1999–2000, and qualifying for the group stages of the 2005–06 UEFA Cup.

Supporting paragraphs: Jan Christiansen Rosenborg BK
Answer: 24