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:
| Rnd | Race | Date | Location | Pole Position | Fastest Lap | Race Winner | Constructor | Report |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | South African Grand Prix | 23 January | Kyalami | René Arnoux | Alain Prost | Alain Prost | Renault | Report |
| 2.0 | Brazilian Grand Prix | 21 March | Jacarepaguá | Alain Prost | Alain Prost | Alain Prost | Renault | Report |
| 3.0 | United States Grand Prix West | 4 April | Long Beach | Andrea de Cesaris | Niki Lauda | Niki Lauda | McLaren - Ford | Report |
| 4.0 | San Marino Grand Prix | 25 April | Imola | René Arnoux | Didier Pironi | Didier Pironi | Ferrari | Report |
| 5.0 | Belgian Grand Prix | 9 May | Zolder | Alain Prost | John Watson | John Watson | McLaren - Ford | Report |
| 6.0 | Monaco Grand Prix | 23 May | Monaco | René Arnoux | Riccardo Patrese | Riccardo Patrese | Brabham - Ford | Report |
| 7.0 | Detroit Grand Prix | 6 June | Detroit | Alain Prost | Alain Prost | John Watson | McLaren - Ford | Report |
| 8.0 | Canadian Grand Prix | 13 June | Circuit Gilles Villeneuve | Didier Pironi | Didier Pironi | Nelson Piquet | Brabham - BMW | Report |
| 9.0 | Dutch Grand Prix | 3 July | Zandvoort | René Arnoux | Derek Warwick | Didier Pironi | Ferrari | Report |
| 10.0 | British Grand Prix | 18 July | Brands Hatch | Keke Rosberg | Brian Henton | Niki Lauda | McLaren - Ford | Report |
| 11.0 | French Grand Prix | 25 July | Paul Ricard | René Arnoux | Riccardo Patrese | René Arnoux | Renault | Report |
| 12.0 | German Grand Prix | 8 August | Hockenheimring | Didier Pironi | Nelson Piquet | Patrick Tambay | Ferrari | Report |
| 13.0 | Austrian Grand Prix | 15 August | Österreichring | Nelson Piquet | Nelson Piquet | Elio de Angelis | Lotus - Ford | Report |
| 14.0 | Swiss Grand Prix | 29 August | Dijon | Alain Prost | Alain Prost | Keke Rosberg | Williams - Ford | Report |
| 15.0 | Italian Grand Prix | 12 September | Monza | Mario Andretti | René Arnoux | René Arnoux | Renault | Report |
Question:
What is the constructor for 9 May?
Answer:
McLaren - Ford