user: Question: Which Opponent has an Attendance of Bye?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 25, 1960', 'Cleveland Browns', 'L 24–41', '56,303']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = 'Bye';