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 |
| --- | --- | --- | --- | --- |
| Niki Lauda | McLaren - TAG | 79.0 | 1:31:11.951 | 9.0 |
| Patrick Tambay | Renault | 79.0 | + 7.154 | 1.0 |
| Nigel Mansell | Lotus - Renault | 79.0 | + 23.969 | 6.0 |
| René Arnoux | Ferrari | 79.0 | + 43.706 | 11.0 |
| Elio de Angelis | Lotus - Renault | 79.0 | + 1:06.125 | 2.0 |
| Keke Rosberg | Williams - Honda | 78.0 | + 1 Lap | 4.0 |
| Alain Prost | McLaren - TAG | 78.0 | + 1 Lap | 5.0 |
| Jacques Laffite | Williams - Honda | 78.0 | + 1 Lap | 12.0 |
| Teo Fabi | Brabham - BMW | 78.0 | + 1 Lap | 17.0 |
| Andrea de Cesaris | Ligier - Renault | 77.0 | + 2 Laps | 26.0 |
| Thierry Boutsen | Arrows - BMW | 77.0 | + 2 Laps | 14.0 |
| Piercarlo Ghinzani | Osella - Alfa Romeo | 74.0 | + 5 Laps | 25.0 |
| Jonathan Palmer | RAM - Hart | 72.0 | + 7 Laps | 21.0 |
| Martin Brundle | Tyrrell - Ford | 76.0 | Disqualified | 23.0 |
| Mauro Baldi | Spirit - Hart | 61.0 | Engine | 24.0 |
| Derek Warwick | Renault | 53.0 | Accident | 7.0 |
| Marc Surer | Arrows - Ford | 51.0 | Accident | 19.0 |
| Eddie Cheever | Alfa Romeo | 51.0 | Engine | 16.0 |
| Ayrton Senna | Toleman - Hart | 35.0 | Turbo | 13.0 |
| Michele Alboreto | Ferrari | 33.0 | Engine | 10.0 |
| Johnny Cecotto | Toleman - Hart | 22.0 | Turbo | 18.0 |
| Riccardo Patrese | Alfa Romeo | 15.0 | Engine | 15.0 |
| Nelson Piquet | Brabham - BMW | 11.0 | Turbo | 3.0 |
| Stefan Bellof | Tyrrell - Ford | 11.0 | Disqualified | 20.0 |
| Manfred Winkelhock | ATS - BMW | 5.0 | Clutch | 8.0 |
| Philippe Alliot | RAM - Hart | 4.0 | Electrical | 22.0 |
Question:
Which Grid did Alain Prost drive on?
Answer:
5.0