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 |
| --- | --- | --- | --- | --- |
| Alberto Ascari | Ferrari | 90 | 2:53:35.8 | 1 |
| Nino Farina | Ferrari | 90 | + 10.4 | 3 |
| Felice Bonetto José Froilán González | Maserati | 89 | + 1 Lap | 13 |
| Mike Hawthorn | Ferrari | 89 | + 1 Lap | 6 |
| Toulo de Graffenried | Maserati | 88 | + 2 Laps | 7 |
| Maurice Trintignant | Gordini | 87 | + 3 Laps | 12 |
| Louis Rosier | Ferrari | 86 | + 4 Laps | 8 |
| Peter Collins | HWM - Alta | 84 | + 6 Laps | 16 |
| Stirling Moss | Connaught - Lea-Francis | 83 | + 7 Laps | 9 |
| Luigi Villoresi | Ferrari | 67 | Throttle | 4 |
| Kenneth McAlpine | Connaught - Lea-Francis | 63 | Engine | 14 |
| Harry Schell | Gordini | 59 | Transmission | 10 |
| Johnny Claes | Connaught - Lea-Francis | 52 | Not Classified | 17 |
| Juan Manuel Fangio | Maserati | 36 | Axle | 2 |
| Roberto Mieres | Gordini | 28 | Transmission | 19 |
| José Froilán González | Maserati | 22 | Rear Axle | 5 |
| Ken Wharton | Cooper - Bristol | 19 | Physical | 18 |
| Roy Salvadori | Connaught - Lea-Francis | 14 | Engine | 11 |
| Lance Macklin | HWM - Alta | 7 | Throttle | 15 |
| Source: | Source: | Source: | Source: | Source: |
Question:
Who is the driver when the grid is 18?
Answer:
Ken Wharton