Question: Right before the start of the 2012-2013 season, who was the Brazilian central defender the FC Bayern Munich signed?
Sentence (from "FC Bayern Munich"): It is best known for its professional football team, which plays in the Bundesliga, the top tier of the German football league system, and is the most successful club in German football history, having won a record 27 national titles and 18 national cups.
Relevant evidence: No