user: Question: who was the opponent when the week was 9?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', '1986-09-08', 'at Dallas Cowboys', 'L 28–31', 'Texas Stadium', '59,804']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" = '9';