Question: The 2010–11 Tour de Ski was the 5th edition of the Tour de Ski and took place from 31 December 2010 to which date, Swiss cross-country skier, Dario Cologna won the Men's class?
Sentence (from "Dario Cologna"): He has four overall World Cup victories, three Olympic gold medals, one World Championships gold medal and three Tour de Ski victories in his career so far.
Relevant evidence: No