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:
| Stage | Winner | General classification | Points classification | Mountains classification | Young rider classification |
| --- | --- | --- | --- | --- | --- |
| 1.0 | HTC-Highroad | Marco Pinotti | not awarded | not awarded | Bjørn Selander |
| 2.0 | Alessandro Petacchi | Mark Cavendish | Alessandro Petacchi | Sebastian Lang | Bjørn Selander |
| 3.0 | Ángel Vicioso | David Millar | Alessandro Petacchi | Gianluca Brambilla | Jan Bakelants |
| 4.0 | Stage neutralised | David Millar | Alessandro Petacchi | Gianluca Brambilla | Jan Bakelants |
| 5.0 | Pieter Weening | Pieter Weening | Alessandro Petacchi | Martin Kohler | Steven Kruijswijk |
| 6.0 | Francisco Ventoso | Pieter Weening | Alessandro Petacchi | Martin Kohler | Steven Kruijswijk |
| 7.0 | Bart De Clercq | Pieter Weening | Alessandro Petacchi | Bart De Clercq | Steven Kruijswijk |
| 8.0 | Oscar Gatto | Pieter Weening | Alessandro Petacchi | Bart De Clercq | Steven Kruijswijk |
| 9.0 | Alberto Contador José Rujano | Alberto Contador Kanstantsin Sivtsov | Alberto Contador Alessandro Petacchi | Filippo Savini | Roman Kreuziger |
| 10.0 | Mark Cavendish | Alberto Contador Kanstantsin Sivtsov | Alessandro Petacchi | Filippo Savini | Roman Kreuziger |
| 11.0 | John Gadret | Alberto Contador Kanstantsin Sivtsov | Alessandro Petacchi | Filippo Savini | Roman Kreuziger |
| 12.0 | Mark Cavendish | Alberto Contador Kanstantsin Sivtsov | Alessandro Petacchi | Filippo Savini | Roman Kreuziger |
| 13.0 | José Rujano | Alberto Contador Vincenzo Nibali | Alberto Contador Roberto Ferrari | Alberto Contador José Rujano | Roman Kreuziger |
| 14.0 | Igor Antón | Alberto Contador Vincenzo Nibali | Alberto Contador Michele Scarponi | Alberto Contador José Rujano | Roman Kreuziger |
| 15.0 | Mikel Nieve | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
| 16.0 | Alberto Contador Vincenzo Nibali | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
| 17.0 | Diego Ulissi | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
| 18.0 | Eros Capecchi | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
| 19.0 | Paolo Tiralongo | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
| 20.0 | Vasil Kiryienka | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
| 21.0 | David Millar | Alberto Contador Michele Scarponi | Alberto Contador Michele Scarponi | Stefano Garzelli | Roman Kreuziger |
Question:
Who was the young rider classification when Alessandro Petacchi won?
Answer:
Bjørn Selander