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 | Opponent | Result | Game site | Attendance |
| --- | --- | --- | --- | --- |
| 1 | at San Diego Chargers | L 14–21 | San Diego Stadium | 54,061 |
| 2 | at Houston Oilers | W 20–16 | Astrodome | 46,498 |
| 3 | at Denver Broncos | W 16–3 | Mile High Stadium | 51,200 |
| 4 | San Diego Chargers | W 31–10 | Municipal Stadium | 50,514 |
| 5 | Pittsburgh Steelers | W 38–16 | Municipal Stadium | 49,533 |
| 6 | Washington Redskins | W 27–20 | Municipal Stadium | 51,989 |
| 7 | at Oakland Raiders | T 20–20 | Oakland-Alameda County Coliseum | 54,715 |
| 8 | at New York Jets | L 13–10 | Shea Stadium | 62,812 |
| 9 | Cleveland Browns | W 20–14 | Municipal Stadium | 50,388 |
| 10 | Denver Broncos | W 28–10 | Municipal Stadium | 49,945 |
| 11 | at Detroit Lions | L 21–32 | Tiger Stadium | 54,418 |
| 12 | at San Francisco 49ers | W 26–17 | Candlestick Park | 45,306 |
| 13 | Oakland Raiders | W 16–14 | Municipal Stadium | 51,215 |
| 14 | Buffalo Bills | W 22–9 | Municipal Stadium | 48,121 |
| 1971 NFL playoffs | 1971 NFL playoffs | 1971 NFL playoffs | 1971 NFL playoffs | 1971 NFL playoffs |
| Divisional Playoffs | Miami Dolphins | L 24–27 (2OT) | Municipal Stadium | 45,822 |
Question:
Who was the opponent when 48,121 people attended?
Answer:
Buffalo Bills