user: Question: Who was the opponent at the game attended by 45,000?
Columns: ['Date', 'Opponent#', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['10/03/1925', 'North Dakota', 'Memorial Stadium • Minneapolis, MN', 'W25-6', '20,000']
SQL:

assistant: SELECT "Opponent#" FROM "Table" WHERE "Attendance" = '45,000';