user: Question: Who is the shirt sponsor for Captain Geoff Thomas' team?
Columns: ['Team', 'Manager', 'Captain', 'Kit manufacturer', 'Shirt sponsor']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Arsenal', 'George Graham', 'Tony Adams', 'Adidas', 'JVC']
SQL:

assistant: SELECT "Shirt sponsor" FROM "Table" WHERE "Captain" = 'Geoff Thomas';