user: Question: Who is the team captain for the team with Sparkasse (Düsseldorf) as the shirt sponsor?
Columns: ['Team', 'Head coach', 'Team captain', 'Kitmaker', 'Shirt sponsor']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Alemannia Aachen', 'Michael Krüger', 'Benjamin Auer', 'Nike', 'Aachen Münchener']
SQL:

assistant: SELECT "Team captain" FROM "Table" WHERE "Shirt sponsor" = 'Sparkasse (Düsseldorf)';