user: Question: Name the chairman for Iker Casillas
Columns: ['Team', 'Chairman', 'Head Coach', 'Captain', 'Kitmaker', 'Shirt sponsor']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Athletic Bilbao', 'Josu Urrutia', 'Marcelo Bielsa', 'Carlos Gurpegui', 'Umbro', 'Petronor']
SQL:

assistant: SELECT "Chairman" FROM "Table" WHERE "Captain" = 'Iker Casillas';