Question: What is the nationality of the football league system that Nicolai Poulsen plays in?  

Context paragraphs:
Oberliga Rheinland-Pfalz/Saar: The Oberliga Rheinland-Pfalz/Saar, formerly the "Oberliga Südwest", is the highest regional football league for the Rhineland-Palatinate and Saarland states of Germany.  It is the fifth tier of the German football league system.  It is one of fourteen Oberligas in German football, the fifth tier of the German football league system.  Until the introduction of the 3.  Liga in 2008 it was the fourth tier of the league system, until the introduction of the Regionalligas in 1994 the third tier.

Nicolai Poulsen: Nicolai Poulsen (born 15 August 1993) is a Danish footballer who currently plays as a midfielder for Sarpsborg 08 in the Eliteserien.

National League System: The National League System comprises the seven levels of the English football league system immediately below the level of the English Football League.  It contains 86 league competitions and more than 1,600 clubs.  It comes under the jurisdiction of The Football Association.  The National League System has a hierarchical format with promotion and relegation between leagues at different levels.  For details of leagues above and below the National League System, see the English football league system.

Bayernliga: The Bayernliga (English: Bavarian league) is the highest amateur football league and the second highest football league (under the Regionalliga Bayern) in the state of Bavaria (German: "Bayern" ) and the Bavarian football league system.  It is one of fourteen Oberligas in German football, the fifth tier of the German football league system.  Until the introduction of the 3.  Liga in 2008 it was the fourth tier of the league system, until the introduction of the Regionalligas in 1994 the third tier.

Hessenliga: The Hessenliga (until 2008 "Oberliga Hessen") is the highest football league in the state of Hesse and the Hessian football league system.  It is one of fourteen Oberligas in German football, the fifth tier of the German football league system.  Until the introduction of the 3.  Liga in 2008 it was the fourth tier of the league system, until the introduction of the Regionalligas in 1994 the third tier.

Oberliga Baden-Württemberg: The Oberliga Baden-Württemberg is the highest association football league in the state of Baden-Württemberg and the Baden-Württemberg football league system.  It is one of fourteen Oberligas in German football, the fifth tier of the German football league system.  Until the introduction of the 3.  Liga in 2008 it was the fourth tier of the league system, until the introduction of the Regionalligas in 1994 the third tier.

Eliteserien (football): Eliteserien (] ) is a Norwegian professional league for association football clubs.  At the top of the Norwegian football league system, it is the country's primary football competition.

List of clubs in the Bayernliga: This is a List of clubs in the Bayernliga, including all clubs and their final placings from 1945–46 to the current one.  The league, commonly referred to as the "Bayernliga", is the highest football league in the state of Bavaria (German: "Bayern" ) and the Bavarian football league system.  It is one of fourteen Oberligas in German football, the fifth tier of the German football league system.  Until the introduction of the 3.  Liga in 2008 it was the fourth tier of the league system, until the introduction of the Regionalligas in 1994 the third tier.

Greek FCA Winners' Championship: The FCA Winners' Championship (Greek: Πρωτάθλημα Πρωταθλητριών Ε.Π.Σ. )  is a Greek football league competition contested annually by the most recent winners of all local Football Clubs' Associations championships in Greece.  It is not considered part of the Greek football league system, due to a lack of formal structure, requiring all local FCA championships to have been completed prior to its start.  The FCA Winners' Championship was ←founded in 1960, and held annually until 1962, as an experimental format for a 2nd tier in the Greek football league system.  The competition was once again established and held annually during 1968−1977 going by the name "Amateur Championship" as a means of achieving promotion to the formally-structured "Beta Ethniki" (the official 2nd tier of the Greek football league system, renamed in 2010 to "Football League").

Mid-Sussex Football League: The Mid-Sussex Football League (currently sponsored by Gray Hooper Holt LLP) is a football competition in England.  It has a total of 11 divisions headed by the Premier Division which sits at level 12 of the National League System.  With level 12 status of the English football league system, it is a feeder to the Southern Combination League Division Three.  The bottom division, Division Nine, is currently the 22nd and lowest tier of the English football league system.

Supporting paragraphs: Nicolai Poulsen Eliteserien (football)
Answer: Norwegian