user: Question: Which Opponent that has a Week larger than 3 on October 6, 1991?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 1, 1991', 'Los Angeles Raiders', 'W 47–17', '61,367']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" > 3.0 AND "Date" = 'October 6, 1991';