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 |
| --- | --- | --- | --- | --- | --- | --- |
| Footscray | 16.16 (112) | Richmond | 12.9 (81) | Western Oval | 33753.0 | 23 April 1955 |
| Essendon | 16.24 (120) | St Kilda | 8.7 (55) | Windy Hill | 18000.0 | 23 April 1955 |
| Melbourne | 16.15 (111) | Geelong | 8.14 (62) | MCG | 32363.0 | 23 April 1955 |
| South Melbourne | 16.11 (107) | Fitzroy | 9.15 (69) | Lake Oval | 18000.0 | 23 April 1955 |
| North Melbourne | 9.16 (70) | Collingwood | 21.11 (137) | Arden Street Oval | 21000.0 | 23 April 1955 |
| Hawthorn | 12.15 (87) | Carlton | 9.6 (60) | Glenferrie Oval | 19000.0 | 23 April 1955 |
Question:
Who is the away side when north melbourne is the home side?
Answer:
Collingwood