user: Question: At which site was Northwestern an opponent?
Columns: ['Date', 'Opponent#', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['09/22/1945', 'Missouri', 'Memorial Stadium • Minneapolis, MN', 'W34-0', '34,246']
SQL:

assistant: SELECT "Site" FROM "Table" WHERE "Opponent#" = 'Northwestern';