user: Question: Which Opponent was played on 1991-10-13?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '1991-09-01', 'Tampa Bay Buccaneers', 'W 16–13', 'The Meadowlands', '61,204']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = '1991-10-13';