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 | Sheffield Wednesday | 2–2 | Chelsea | 9 March 1968 |
| Replay | Chelsea | 2–0 | Sheffield Wednesday | 12 March 1968 |
| 2 | Everton | 2–0 | Tranmere Rovers | 9 March 1968 |
| 3 | Tottenham Hotspur | 1–1 | Liverpool | 9 March 1968 |
| Replay | Liverpool | 2–1 | Tottenham Hotspur | 12 March 1968 |
| 4 | Portsmouth | 1–2 | West Bromwich Albion | 9 March 1968 |
| 5 | West Ham United | 1–2 | Sheffield United | 9 March 1968 |
| 6 | Arsenal | 1–1 | Birmingham City | 9 March 1968 |
| Replay | Birmingham City | 2–1 | Arsenal | 12 March 1968 |
| 7 | Leeds United | 2–0 | Bristol City | 9 March 1968 |
| 8 | Rotherham United | 1–1 | Leicester City | 9 March 1968 |
| Replay | Leicester City | 2–0 | Rotherham United | 13 March 1968 |
Question:
What away team has a Tie no of 5?
Answer:
Sheffield United