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:
| City proper | Population City limits in millions | Density per km² | Urban area | Population Urban area in millions | Metro area | Population Metro area in millions |
| --- | --- | --- | --- | --- | --- | --- |
| London, UK | 7.5 | 4761.0 | Paris, France | 10.1 | London, UK | 12–14 |
| Berlin , Germany | 3.4 | 3815.0 | London, UK | 8.5 | Paris, France | 11.7 |
| Madrid , Spain | 3.1 | 1985.0 | Madrid , Spain | 5.5 | Rhine-Ruhr , Germany | 10.2 |
| Rome , Italy | 2.7 | 5198.0 | Ruhr , Germany | 5.3 | Randstad , Netherlands | 7.0 |
| Paris , France | 2.2 | 24672.0 | Barcelona , Spain | 4.5 | Madrid , Spain | 5.8 |
| Bucharest , Romania | 1.9 | 9131.0 | Milan , Italy | 3.8 | Barcelona , Spain | 5.3 |
| Hamburg , Germany | 1.8 | 2310.0 | Berlin , Germany | 3.7 | Milan , Italy | 4.3 |
| Warsaw , Poland | 1.7 | 3258.0 | Rotterdam – The Hague , Netherlands | 3.3 | Berlin , Germany | 4.3 |
| Budapest , Hungary | 1.7 | 3570.0 | Athens , Greece | 3.2 | Frankfurt Rhine-Main , Germany | 4.1 |
| Vienna , Austria | 1.7 | 3931.0 | Naples , Italy | 2.9 | Athens , Greece | 3.9 |
Question:
Which urban area has a population of 5.3 million?
Answer:
Ruhr , Germany