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 | Game site | Record | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 9, 1960 | at Boston Patriots | W 13–10 | Boston University Field | 1–0 | 21597.0 |
| 2.0 | September 18, 1960 | at Buffalo Bills | W 27–21 | War Memorial Stadium | 2–0 | 15229.0 |
| 3.0 | September 23, 1960 | at New York Titans | L 24–28 | Polo Grounds | 2–1 | 20462.0 |
| 4.0 | October 2, 1960 | Oakland Raiders | W 31–14 | Bears Stadium | 3–1 | 18372.0 |
| 6.0 | October 16, 1960 | Los Angeles Chargers | L 19–23 | Bears Stadium | 3–2 | 19141.0 |
| 7.0 | October 23, 1960 | Boston Patriots | W 31–24 | Bears Stadium | 4–2 | 12683.0 |
| 8.0 | October 30, 1960 | Dallas Texans | L 14–17 | Bears Stadium | 4–3 | 13002.0 |
| 9.0 | November 6, 1960 | Houston Oilers | L 25–45 | Bears Stadium | 4–4 | 14489.0 |
| 10.0 | November 13, 1960 | at Dallas Texans | L 7–34 | Cotton Bowl | 4–5 | 21000.0 |
| 11.0 | November 20, 1960 | at Houston Oilers | L 10–20 | Jeppesen Stadium | 4–6 | 20778.0 |
| 12.0 | November 27, 1960 | Buffalo Bills | T 38–38 | Bears Stadium | 4–6–1 | 7785.0 |
| 13.0 | December 4, 1960 | New York Titans | L 27–30 | Bears Stadium | 4–7–1 | 5861.0 |
| 14.0 | December 10, 1960 | at Los Angeles Chargers | L 33–41 | Los Angeles Memorial Coliseum | 4–8–1 | 9928.0 |
| 15.0 | December 17, 1960 | at Oakland Raiders | L 10–48 | Candlestick Park | 4–9–1 | 7000.0 |
Question:
Which team was the opponent on week 15?
Answer:
at Oakland Raiders