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:
| Rider | Manufacturer | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Dani Pedrosa | Honda | 24 | 40:46.694 | 7 |
| Andrea Dovizioso | Honda | 24 | +0.356 | 3 |
| Steve Jenkner | Aprilia | 24 | +0.548 | 6 |
| Youichi Ui | Aprilia | 24 | +0.754 | 1 |
| Pablo Nieto | Aprilia | 24 | +0.839 | 2 |
| Alex de Angelis | Aprilia | 24 | +1.965 | 4 |
| Mika Kallio | Honda | 24 | +13.997 | 8 |
| Lucio Cecchinello | Aprilia | 24 | +14.790 | 11 |
| Masao Azuma | Honda | 24 | +16.790 | 12 |
| Casey Stoner | Aprilia | 24 | +20.649 | 19 |
| Gino Borsoi | Aprilia | 24 | +21.809 | 15 |
| Arnaud Vincent | KTM | 24 | +22.015 | 14 |
| Héctor Barberá | Aprilia | 24 | +23.814 | 13 |
| Simone Corsi | Honda | 24 | +23.871 | 16 |
| Mirko Giansanti | Aprilia | 24 | +24.786 | 9 |
| Gioele Pellino | Aprilia | 24 | +39.565 | 24 |
| Thomas Lüthi | Honda | 24 | +42.280 | 22 |
| Fabrizio Lai | Malaguti | 24 | +42.379 | 25 |
| Gábor Talmácsi | Aprilia | 24 | +51.145 | 10 |
| Marco Simoncelli | Aprilia | 24 | +51.186 | 18 |
| Stefano Bianco | Gilera | 24 | +53.316 | 17 |
| Mike Di Meglio | Aprilia | 24 | +55.253 | 30 |
| Emilio Alzamora | Derbi | 24 | +56.952 | 21 |
| Jorge Lorenzo | Derbi | 24 | +57.035 | 20 |
| Álvaro Bautista | Aprilia | 24 | +58.109 | 26 |
| Chris Martin | Aprilia | 24 | +58.622 | 28 |
| Julián Simón | Malaguti | 24 | +1:05.036 | 27 |
| Roberto Locatelli | KTM | 24 | +1:11.674 | 29 |
| Peter Lenart | Honda | 24 | +1:35.808 | 33 |
| Max Sabbatani | Aprilia | 10 | Retirement | 23 |
| Leon Camier | Honda | 7 | Retirement | 32 |
| Imre Tóth | Honda | 2 | Retirement | 31 |
| Stefano Perugini | Aprilia | 1 | Retirement | 5 |
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Question:
WHAT IS THE RIDER WITH A 21 GRID?
Answer:
Emilio Alzamora