user: Question: What was the opponent on December 16, 1989?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 10, 1989', 'at Detroit Lions', 'W 16-13', 36735.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = 'December 16, 1989';