user: Question: Who was the opponent against which the result was W20-0?
Columns: ['Date', 'Opponent', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['09/28/1935', 'North Dakota State', 'Memorial Stadium • Minneapolis, MN', 'W26-6', '35,000']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'W20-0';