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:
| Tie no | Home team | Score | Away team | Date |
| --- | --- | --- | --- | --- |
| 1.0 | Birmingham | 3–0 | Watford | 14 February 1931 |
| 2.0 | Sunderland | 2–1 | Sheffield United | 14 February 1931 |
| 3.0 | Everton | 5–3 | Grimsby Town | 14 February 1931 |
| 4.0 | Barnsley | 1–3 | Wolverhampton Wanderers | 14 February 1931 |
| 5.0 | Portsmouth | 0–1 | West Bromwich Albion | 14 February 1931 |
| 6.0 | Chelsea | 3–0 | Blackburn Rovers | 14 February 1931 |
| 7.0 | Exeter City | 3–1 | Leeds United | 14 February 1931 |
| 8.0 | Southport | 1–0 | Bradford Park Avenue | 14 February 1931 |
Question:
Who was the away team when the home team was Sunderland?
Answer:
Sheffield United