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:
| Race | Date | Location | Pole Position | Fastest Lap | Race Winner | Constructor | Report |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Brazilian Grand Prix | 23 March | Jacarepaguá | Ayrton Senna | Nelson Piquet | Nelson Piquet | Williams - Honda | Report |
| Spanish Grand Prix | 13 April | Jerez | Ayrton Senna | Nigel Mansell | Ayrton Senna | Lotus - Renault | Report |
| San Marino Grand Prix | 27 April | Imola | Ayrton Senna | Nelson Piquet | Alain Prost | McLaren - TAG | Report |
| Monaco Grand Prix | 11 May | Monaco | Alain Prost | Alain Prost | Alain Prost | McLaren - TAG | Report |
| Belgian Grand Prix | 25 May | Spa-Francorchamps | Nelson Piquet | Alain Prost | Nigel Mansell | Williams - Honda | Report |
| Canadian Grand Prix | 15 June | Circuit Gilles Villeneuve | Nigel Mansell | Nelson Piquet | Nigel Mansell | Williams - Honda | Report |
| Detroit Grand Prix | 22 June | Detroit | Ayrton Senna | Nelson Piquet | Ayrton Senna | Lotus - Renault | Report |
| French Grand Prix | 6 July | Paul Ricard | Ayrton Senna | Nigel Mansell | Nigel Mansell | Williams - Honda | Report |
| British Grand Prix | 13 July | Brands Hatch | Nelson Piquet | Nigel Mansell | Nigel Mansell | Williams - Honda | Report |
| German Grand Prix | 27 July | Hockenheimring | Keke Rosberg | Gerhard Berger | Nelson Piquet | Williams - Honda | Report |
| Hungarian Grand Prix | 10 August | Hungaroring | Ayrton Senna | Nelson Piquet | Nelson Piquet | Williams - Honda | Report |
| Austrian Grand Prix | 17 August | Österreichring | Teo Fabi | Gerhard Berger | Alain Prost | McLaren - TAG | Report |
| Italian Grand Prix | 7 September | Monza | Teo Fabi | Teo Fabi | Nelson Piquet | Williams - Honda | Report |
| Portuguese Grand Prix | 21 September | Estoril | Ayrton Senna | Nigel Mansell | Nigel Mansell | Williams - Honda | Report |
| Mexican Grand Prix | 12 October | Hermanos Rodriguez | Ayrton Senna | Nelson Piquet | Gerhard Berger | Benetton - BMW | Report |
| Australian Grand Prix | 26 October | Adelaide | Nigel Mansell | Nelson Piquet | Alain Prost | McLaren - TAG | Report |
Question:
What was the pole position for the belgian grand prix?
Answer:
Nelson Piquet