During the 2004-05 FC Bayern Munich season, the team won the German double in large part because of the success of which centre-forward?
2004–05 FC Bayern Munich season: FC Bayern Munich won the German double for the second time in three seasons, ensuring the first season for Felix Magath as manager was a successful one. 2004–05 FC Bayern Munich season:  Among the key players in the success were Roy Makaay and playmaker Michael Ballack. Roy Makaay: Rudolphus Antonius "Roy" Makaay (born 9 March 1975) is a Dutch football manager and former footballer who played as a centre-forward. Roy Makaay:  He was known for his goal-scoring ability as a result of his "aerial prowess and quick drives to the net where he can put the ball away with either foot."
Rudolphus Antonius "Roy" Makaay