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 12, 2004 | Seattle Seahawks | L 21-7 | 64,900 |
| 2.0 | September 19, 2004 | San Francisco 49ers | W 30-27 | 64,900 |
| 3.0 | September 26, 2004 | at St. Louis Rams | W 28-25 | 65,856 |
| 4.0 | October 3, 2004 | at Arizona Cardinals | L 34-10 | 28,109 |
| 5.0 | October 10, 2004 | Tampa Bay Buccaneers | L 20-17 | 64,900 |
| 6.0 | October 17, 2004 | Minnesota Vikings | L 38-31 | 64,900 |
| 7.0 | October 24, 2004 | at Oakland Raiders | W 31-26 | 45,337 |
| 8.0 | Bye | Bye | Bye | Bye |
| 9.0 | November 7, 2004 | at San Diego Chargers | L 43-17 | 59,662 |
| 10.0 | November 14, 2004 | Kansas City Chiefs | W 27-20 | 64,900 |
| 11.0 | November 21, 2004 | Denver Broncos | L 34-13 | 64,900 |
| 12.0 | November 28, 2004 | at Atlanta Falcons | L 24-21 | 70,521 |
| 13.0 | December 5, 2004 | Carolina Panthers | L 32-21 | 58,878 |
| 14.0 | December 12, 2004 | at Dallas Cowboys | W 27-13 | 64,056 |
| 15.0 | December 19, 2004 | at Tampa Bay Buccaneers | W 21-17 | 65,075 |
| 16.0 | December 26, 2004 | Atlanta Falcons | W 26-13 | 64,900 |
| 17.0 | January 2, 2005 | at Carolina Panthers | W 21-18 | 73,302 |
Question:
What is the Opponent at the game with an Attendance of 64,900 in Week prior to 15 with a Result of L 38-31?
Answer:
Minnesota Vikings