Question: Since October 29, 2013 Matthias Strolz has been a member of a house of the Austrian Parliament frequently referred to as what?

Context paragraphs:
National Council (Austria): The National Council ("Nationalrat") is one of the two houses of the Austrian Parliament and is frequently referred to as the lower house.  The constitution endows the National Council far more power than the Federal Council.

Austrian Parliament Building: The Austrian Parliament Building (German: "Parlamentsgebäude" , colloquially "das Parlament") in Vienna is where the two houses of the Austrian Parliament conduct their sessions.  The building is located on the "Ringstraße" boulevard in the first district "Innere Stadt", near Hofburg Palace and the Palace of Justice.  It was built to house the two chambers of the Imperial Council ("Reichsrat"), the bicameral legislature of the Cisleithanian (Austrian) part of the Austro-Hungarian Empire.  Since its construction, the Parliament Building has been the seat of these two houses, and their successors—the National Council ("Nationalrat") and the Federal Council ("Bundesrat")—of the Austrian legislature.

House of Lords (Austria): The House of Lords (German: "Herrenhaus" , Czech: "Panská sněmovna" , Italian: "Camera dei signori" , Slovene: "Gosposka zbornica" , Polish: "Izba Panów" ) was the upper house of the Imperial Council, the bicameral legislature of the Austrian Empire from 1861 and of the Cisleithanian (Austrian) half of Austria-Hungary upon the Compromise of 1867.  Created by the February Patent issued by Emperor Franz Joseph I on 26 February 1861, it existed until the end of World War I and the dissolution of the Dual Monarchy, when on 12 November 1918 the transitional National Assembly of German-Austria declared it abolished.  It was superseded by the Federal Council of the Austrian Parliament implemented by the 1920 Federal Constitutional Law.

Christoph Matznetter: Christoph Matznetter (born 8 June 1959 in Vienna) is an Austrian politician.  He has been a member of the Austrian Parliament since 2002.  His service in parliament was interrupted by a brief tenure from 2007 to 2008 as State Secretary in the Federal Ministry of Finance.  He is a member of the Social Democratic Party.

Nikolaus Berlakovich: Nikolaus Berlakovich (born June 4, 1961 in Eisenstadt, Austria), is an Austrian politician.  He served as Minister for Agriculture from 2008 to 2013 in the First Faymann cabinet and has been a member of the Austrian parliament since 2013.  Prior to his tenure at federal level, he was member of the provincial parliament of Burgenland (1991–2005) and of the provincial government of Burgenland (2005-2008).

Matthias Strolz: Matthias Strolz (born June 10, 1973) is an Austrian politician.  He is the founder and leader of the political party NEOS – The New Austria and Liberal Forum and has been a member of Austria's National Council since October 29, 2013.

Ali Velshi: Ali Velshi (born October 29, 1969) is a Canadian television journalist, anchor of MSNBC Live, and, alongside Stephanie Ruhle, a senior economic and business correspondent for NBC News since October 2016.  Known for his work on CNN, he was CNN's Chief Business Correspondent, Anchor of CNN's "Your Money" and a co-host of CNN International's weekday business show "World Business Today".  In 2013, he joined Al Jazeera America, a channel that launched in August 2013.  He continued to host the program until Al Jazeera America ceased operations on April 12, 2016.  He has worked for MSNBC since October 2016.

Václav Fresl: Václav Fresl (14 October 1868, in Pelhřimov, Kingdom of Bohemia – 23 December 1915) was a Czech politician of the late-nineteenth and early twentieth centuries.  He was a member of the Czech National Socialist Party from Pilsen/Plzeň and was a member of the Imperial Council in Vienna.  Fresl was a close collaborator of Václav Klofáč and was infamous in Austrian parliamentary circles as a leader in the disruptions that often paralyzed the Austrian parliament.  Fresl once kept the parliament from transacting its business by speaking for more than 13 hours straight, after which he had to be carried from the hall by supporters.

Peter Mitterer: Peter Mitterer (November 23, 1946 – October 25, 2013) was an Austrian politician.  Mitterer served as a member the Federal Council, the upper chamber of the Austrian Parliament, from 2005 until his death in 2013.  He simultaneously served as the President of the Federal Council of Austria in 2005 and again in 2010.

Emil Baumgärtel: Emil Baumgärtel (10 January 1885 in Wernersreuth, Austro-Hungarian Empire – 27 September 1939 in Vienna, Austria) was an Austrian politician for the Social Democratic Party of Austria (SPÖ).  Baumgärtel attended a two-class village school and was trained as a bookseller.  He became a bookseller in Wrocław, Frankfurt, and Vienna.  In 1919, he was vice chairman of the Workers' council for Upper Austria.  From 1919 to 1925, he was a member of the Upper Austrian parliament, and also as a provincial Deputy Provincial.  From 10 November 1920 to 17 February 1934, he was a Member of the National Council.  He was also vice president of the Austrian Chamber of Labour.  In 2001, a street in Linz was named after him.

Supporting paragraphs: Matthias Strolz National Council (Austria)
Answer: the lower house