user: Question: Who was the opponent on December 18, 2005?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 11, 2005', 'at Buffalo Bills', 'L 22–7', '71,781']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = 'December 18, 2005';