Task: Question Answering
Input (English): Context: The Umbau - Wagen or Umbauwagen was a type of German railway passenger coach operated by the Deutsche Bundesbahn ( DB ) which appeared in the mid- 1950s . The name means `` rebuild coach '' and they were made by rebuilding or converting former state railway ( Länderbahn ) compartment coaches , many of which were over 30 years old ., Deutsche Bahn AG (abbreviated as "DB", "DB AG" or "DBAG") is a German railway company. Headquartered in Berlin, it is a private joint-stock company (AG), with the Federal Republic of Germany being its single shareholder. Deutsche Bahn describes itself as the second-largest transport company in the world, after the German postal and logistics company Deutsche Post / DHL, and is the largest railway operator and infrastructure owner in Europe. It carries about two billion passengers each year., The Deutsche Bundesbahn or DB (German Federal Railway) was formed as the state railway of the newly established Federal Republic of Germany (FRG) on 7 September 1949 as a successor of the Deutsche Reichsbahn-Gesellschaft (DRG). The DB remained the state railway of West Germany until after German reunification, when it was merged with the former East German Deutsche Reichsbahn (DR) to form Deutsche Bahn AG, which came into existence on 1 January 1994., The German reunification was the process in 1990 in which the German Democratic Republic (GDR/East Germany) joined the Federal Republic of Germany (FRG/West Germany) to form the reunited nation of Germany, and when Berlin reunited into a single city, as provided by its then Grundgesetz constitution Article 23. The end of the unification process is officially referred to as German unity, celebrated on 3 October (German Unity Day). Following German reunification, Berlin was once again designated as the capital of united Germany., Subject: umbau-wagen, Relation: operator, Options: (A) deutsche bahn (B) deutsche bundesbahn (C) germany
Output (English): deutsche bahn