Question: Bad Köstritz is a town in the district of Greiz, in Thuringia, Germany, which brewery, founded in 1543, is one of the oldest producers of Schwarzbier (black lager)?

Context paragraphs:
Schwarzbach, Thuringia: Schwarzbach is a municipality in the district of Greiz, in Thuringia, Germany.  The town has a municipal association with Münchenbernsdorf.

Greiz: Greiz is a town in Thuringia, and it is the capital of the district of Greiz.  Greiz is situated in eastern Thuringia on the river "Weiße Elster".

Schömberg, Thuringia: Schömberg is a village and a former municipality in the district of Greiz, in Thuringia, Germany.  Since 31 December 2013, it is part of the town Weida.

Auma-Weidatal: Auma-Weidatal ( ) is a town in the district of Greiz, in Thuringia, Germany.  It was named after the town Auma and the river Weida, that flows through the municipality.  It was formed on 1 December 2011 by the merger of the former municipalities Auma, Braunsdorf, Göhren-Döhlen, Staitz and Wiebelsdorf.  Since January 1996, these and three other municipalities had cooperated in the "Verwaltungsgemeinschaft" ("collective municipality") Auma-Weidatal.  This "Verwaltungsgemeinschaft" was disbanded on 1 December 2011.  The seat of the municipality and of the former "Verwaltungsgemeinschaft" is in Auma.

Münchenbernsdorf: Münchenbernsdorf is a town in the district of Greiz, in Thuringia, Germany.  It is situated approximately 16 km southwest of Gera.  The town is seat of a municipal association with eight members.

Bad Köstritz: Bad Köstritz is a town in the district of Greiz, in Thuringia, Germany.  It is situated on the White Elster river, 7 km northwest of Gera.  Bad Köstritz is known for the Köstritzer brewery and its Schwarzbier (black beer).

Hohenleuben: Hohenleuben is a town in the district of Greiz, in Thuringia, Germany.  It is situated 12 km northwest of Greiz, and 19 km south of Gera.

Vogtländisches Oberland: Vogtländisches Oberland is a former municipality in the district of Greiz, in Thuringia, Germany.  It was disbanded on 31 December 2012.  The villages Cossengrün, Hohndorf and Schönbach became part of the town Greiz, the villages Arnsgrün, Bernsgrün and Pöllwitz became part of the town Zeulenroda-Triebes.  Its population was 2,851 (2011), and its area was 71.62 km.

Köstritzer: The Köstritzer brewery, founded in 1543, is one of the oldest producers of Schwarzbier (black lager) in Germany.  It is located in Bad Köstritz, which is close to Gera in Thuringia.

Wünschendorf/Elster: Wünschendorf/Elster is a municipality in the district of Greiz, in Thuringia, Germany.  The town is seat of a municipal association with eleven members.

Supporting paragraphs: Bad Köstritz Köstritzer
Answer: Köstritzer