Question: What German automotive marque does the high-performance aftermarket tuning company Brabus specialize in?
Related documents: [0]  [DOC] smart Automobile (stylized and marketed as "smart") is a German automotive marque and division of Daimler AG, based in Böblingen, Germany. It ranges in microcars and subcompacts, primarily the Fortwo and Forfour with its primary assembly plants located in Hambach, France and Novo Mesto, Slovenia. Marketed in 46 countries in Asia, North and South America, Africa, Australia and Europe, production of the Fortwo had surpassed 1.7M units by early 2015. [END] 
[1]  [DOC] BRABUS GmbH, founded 1977 in Bottrop (Ruhr Area), Germany, is a high-performance aftermarket tuning company which specializes in Mercedes-Benz, Smart, Tesla and Maybach vehicles. Brabus became the largest Mercedes tuner, other than Mercedes-AMG which became a DaimlerChrysler affiliate in the 1990s. [END] 
Answer: 
Smart
Smart