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 "2008–09 Tour de Ski"): The 2008–09 Tour de Ski was the 3rd edition of the Tour de Ski and took place from 27 December 2008 until 4 January 2009.
Relevant evidence: No