user: Question: What opponent has Balboa Stadium as the opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Stadium', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 10, 1961', 'Denver Broncos', 'L 22–10', 'War Memorial Stadium', '0–1', 16636.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Stadium" = 'Balboa Stadium';