Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | September 11, 2005 | at Buffalo Bills | L 22–7 | 71,781 |
| 2.0 | September 18, 2005 | Pittsburgh Steelers | L 27–7 | 70,742 |
| 3.0 | Bye | Bye | Bye | Bye |
| 4.0 | October 2, 2005 | at Cincinnati Bengals | L 16–10 | 65,714 |
| 5.0 | October 9, 2005 | Tennessee Titans | L 34–20 | 70,430 |
| 6.0 | October 16, 2005 | at Seattle Seahawks | L 42–10 | 66,196 |
| 7.0 | October 23, 2005 | Indianapolis Colts | L 38–20 | 70,621 |
| 8.0 | October 30, 2005 | Cleveland Browns | W 19–16 | 70,064 |
| 9.0 | November 6, 2005 | at Jacksonville Jaguars | L 21–14 | 64,613 |
| 10.0 | November 13, 2005 | at Indianapolis Colts | L 31–17 | 57,209 |
| 11.0 | November 20, 2005 | Kansas City Chiefs | L 45–17 | 70,481 |
| 12.0 | November 27, 2005 | St. Louis Rams | L 33–27 (OT) | 70,010 |
| 13.0 | December 4, 2005 | at Baltimore Ravens | L 16–15 | 69,909 |
| 14.0 | December 11, 2005 | at Tennessee Titans | L 13–10 | 69,149 |
| 15.0 | December 18, 2005 | Arizona Cardinals | W 30–19 | 70,024 |
| 16.0 | December 24, 2005 | Jacksonville Jaguars | L 38–20 | 70,025 |
| 17.0 | January 1, 2006 | at San Francisco 49ers | L 20–17 | 67,970 |
Question:
Who was the opponent on December 18, 2005?
Answer:
Arizona Cardinals