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:
| # | Date | at/vs. | Opponent | Score | Attendance | Record |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | January 5, 1991 | at | Detroit Turbos | 8 - 18 | 6847.0 | Loss |
| 2.0 | January 11, 1991 | vs. | New England Blazers | 11 - 10 | 14789.0 | Win |
| 3.0 | January 19, 1991 | at | New York Saints | 13 - 19 | 9081.0 | Loss |
| 4.0 | January 26, 1991 | vs. | New York Saints | 13 - 8 | 16282.0 | Win |
| 5.0 | February 10, 1991 | vs. | Detroit Turbos | 12 - 14 | 16642.0 | Loss |
| 6.0 | February 22, 1991 | at | New England Blazers | 11 - 13 | 7095.0 | Loss |
| 7.0 | February 28, 1991 | vs. | Pittsburgh Bulls | 11 - 9 | 13712.0 | Win |
| 8.0 | March 9, 1991 | at | Pittsburgh Bulls | 15 - 7 | 8589.0 | Win |
| 9.0 | March 17, 1991 | vs. | Baltimore Thunder | 14 - 17 | 16289.0 | Loss |
Question:
Who was the opponent on February 28, 1991
Answer:
Pittsburgh Bulls