user: Question: Name the opponent for 9 November 1991
Columns: ['Date', 'Opponent', 'Venue', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['10 August 1991', 'Celtic', 'H', '3–4', 16535.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = '9 November 1991';