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:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Felipe Massa | Ferrari | 57 | 1:31:06.970 | 2 |
| Kimi Räikkönen | Ferrari | 57 | + 3.339 | 4 |
| Robert Kubica | BMW Sauber | 57 | + 4.998 | 1 |
| Nick Heidfeld | BMW Sauber | 57 | + 8.409 | 6 |
| Heikki Kovalainen | McLaren - Mercedes | 57 | + 26.789 | 5 |
| Jarno Trulli | Toyota | 57 | + 41.314 | 7 |
| Mark Webber | Red Bull - Renault | 57 | + 45.473 | 11 |
| Nico Rosberg | Williams - Toyota | 57 | + 55.889 | 8 |
| Timo Glock | Toyota | 57 | + 1:09.500 | 13 |
| Fernando Alonso | Renault | 57 | + 1:17.181 | 10 |
| Rubens Barrichello | Honda | 57 | + 1:17.862 | 12 |
| Giancarlo Fisichella | Force India - Ferrari | 56 | + 1 lap | 18 |
| Lewis Hamilton | McLaren - Mercedes | 56 | + 1 lap | 3 |
| Kazuki Nakajima | Williams - Toyota | 56 | + 1 lap | 16 |
| Sébastien Bourdais | Toro Rosso - Ferrari | 56 | + 1 lap | 15 |
| Anthony Davidson | Super Aguri - Honda | 56 | + 1 lap | 21 |
| Takuma Sato | Super Aguri - Honda | 56 | + 1 lap | 22 |
| David Coulthard | Red Bull - Renault | 56 | + 1 lap | 17 |
| Adrian Sutil | Force India - Ferrari | 55 | + 2 laps | 20 |
| Nelson Piquet Jr. | Renault | 40 | Gearbox | 14 |
| Jenson Button | Honda | 19 | Collision | 9 |
| Sebastian Vettel | Toro Rosso - Ferrari | 0 | Collision | 19 |
| Source: | Source: | Source: | Source: | Source: |
Question:
Who constructed the car that had a grid of 6?
Answer:
BMW Sauber