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:
| Home team | Home team score | Away team | Away team score | Venue | Crowd | Date |
| --- | --- | --- | --- | --- | --- | --- |
| North Melbourne | 7.9 (51) | Richmond | 11.19 (85) | Arden Street Oval | 9374.0 | 10 August 1968 |
| Geelong | 10.7 (67) | Hawthorn | 7.9 (51) | Kardinia Park | 20822.0 | 10 August 1968 |
| Carlton | 18.14 (122) | South Melbourne | 11.14 (80) | Princes Park | 15620.0 | 10 August 1968 |
| Melbourne | 10.14 (74) | Footscray | 9.11 (65) | MCG | 18733.0 | 10 August 1968 |
| St Kilda | 12.19 (91) | Fitzroy | 6.5 (41) | Moorabbin Oval | 15643.0 | 10 August 1968 |
| Essendon | 20.18 (138) | Collingwood | 7.11 (53) | Windy Hill | 21300.0 | 10 August 1968 |
Question:
Who played as the away team when Essendon was the home team?
Answer:
Collingwood