Question: What network first aired the show Katja Brandner is in?

full_context: Document 1: Lahnstein family: The Lahnstein family is a very wealthy and aristocratic prestigious fictional family on the German soap opera "Verbotene Liebe (Forbidden Love)". The Lahnsteins have been a staple on "Verbotene Liebe" since their introduction in September 2003.
Document 2: Lydia Brandner: Lydia Brandner (divorced von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe" (Forbidden Love). The role was originated by actress Theresa Underberg on 16 January 2008. Theresa announced on 21 December 2010 that she will leave the show in early 2011. She made her last appearance on 29 March 2011.
Document 3: Jan Brandner: Jan Brandner is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character was played from the show's debut on January 2, 1995 to August 27, 1997 by actor Andreas Brucker. In March 2011, the role was surprisingly recast with actor Hubertus Grimm; reinstating the Brandner family and the original story of the show. Grimm debuted in the role on June 23, 2011. The role was reactivated on short-term for a special of the show on the Spanish island Mallorca. The character made his last appearance on January 18, 2012.
Document 4: Fabian Brandner: Fabian Brandner is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by Shai Hoffmann from January 22, 2008 to August 14, 2008 and in guest appearances from January 12, 2009 to January 22, 2009.
Document 5: Arno Brandner: Arno Brandner is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by actor Konrad Krauss, who first appeared in the series premiere on 2 January 1995.
Document 6: David Brandner: David Brandner is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)" portrayed by actor Sven Koller from September 11, 2008 to June 15, 2010.
Document 7: Verbotene Liebe: Verbotene Liebe (, lit. "Forbidden Love") is a German television soap opera created by Reg Watson for Das Erste. The show is set primarily in the German city of Düsseldorf although, at times, the city of Cologne and the Spanish island of Majorca have figured prominently in the show's story lines. First broadcast on 2 January 1995, "Verbotene Liebe" was originally broadcast in 24-minute episodes, five times a week. It expanded to 45-minute episodes on 21 June 2011 and trimmed back to 40-minute episodes on 23 January 2012 to accommodate an adjusted time-slot. In 2006, Pay-TV network Passion began broadcasting episodes of the show from the beginning.
Document 8: Dana Wolf: Dana Wolf is a fictional character of the German soap opera "Verbotene Liebe (Forbidden Love)". She has been portrayed by Diane Willems from 27 January 2011 to 10 September 2014.
Document 9: Matthias Brandner: Matthias Brandner is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)" portrayed by actor and entertainer Thomas Ohrner. He made his first appearance on screen on 15 January 2008 and had his final appearance on 14 December 2010.
Document 10: Katja Brandner: Katja Brandner is a fictional character on German daytime soap opera "Verbotene Liebe" ("Forbidden Love"). The character was portrayed by actress Diana Frank from January 15, 2008 to January 5, 2009.
Document 11: Oliver Sabel: Oliver Sabel is a popular fictional character in the German soap opera "Verbotene Liebe (Forbidden Love : in English)". The character is portrayed by actor Jo Weil from 31 December 1999 to 3 September 2002 and again since 2 November 2007.
Document 12: Florian Brandner: Florian Brandner is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character was first played by Frédéric A. Komp from 2 January 1995 to the fall of 1996 and again in February 1997 and from June to October 1998. The character was recast with actor Alex Huber four years later, on 12 July 2002. Huber left after one and a half year, when the character was written out. He made his last appearance on 15 January 2004.
Document 13: Jens Kramer: Jens Kramer is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed on recurring basis from September 24, 2008 to March 3, 2009 by actor Antonius Hermlin. The actor returned afterwards as a hallucination, before seen again in September 2010, when Jens is released from a psychiatric clinic, to the character's death in October 2010.
Document 14: Nathalie Brandner: Nathalie Brandner (née Käppler, formerly von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)". The character is portrayed by actress Jenny Winkler. She first appeared on 12 November 2004 and had her final appearance on 14 December 2010.
Document 15: Kim Wolf: Kimberly "Kim" von Lahnstein (adopted Wolf, married Sanchez) is a fictional character of the German soap opera "Verbotene Liebe (Forbidden Love)". Lisa Tomaschewsky introduced the role on April 13, 2011, but was eventually recast with actress Nicole Mieth, who took over the part on May 10, 2011.
ground_truth: Das Erste
sub_queries: Which show is Katja Brandner in? Answer: Verbotene Liebe
What network first aired Verbotene Liebe ? Answer: Das Erste