Table:
text: 2012 Formula One season
Grands Prix
Grands Prix
Rd_ Grand_Prix Pole_position Fastest_lap Winning_driver Winning_constructor Report
1 Australian Grand Prix Lewis Hamilton Jenson Button Jenson Button McLaren - Mercedes Report
2 Malaysian Grand Prix Lewis Hamilton Kimi Räikkönen Fernando Alonso Ferrari Report
3 Chinese Grand Prix Nico Rosberg Kamui Kobayashi Nico Rosberg Mercedes Report
4 Bahrain Grand Prix Sebastian Vettel Sebastian Vettel Sebastian Vettel Red Bull - Renault Report
5 Spanish Grand Prix Pastor Maldonado Romain Grosjean Pastor Maldonado Williams - Renault Report
6 Monaco Grand Prix Mark Webber Sergio Pérez Mark Webber Red Bull - Renault Report
7 Canadian Grand Prix Sebastian Vettel Sebastian Vettel Lewis Hamilton McLaren - Mercedes Report

Question: Who took pole position at the Canadian Grand Prix in the 2012 Formula 1 season?