Which nationality does the 2006 winner of the Tour de France, Óscar Pereiro, hold?

Explanation

Óscar Pereiro Sío (born 1977) is a Spanish former professional cyclist. He is best known for his 2006 victory in Tour de France for Caisse d'Epargne, awarded afte the original winner, Floyd Landis, had been crowned the winner on Champs-Élysées. Landis was disqualified for doping. Perreiro ended his career in 2010 whilst riding for the Kazakhstani team, Astana.