Question: Which nation did the NBA All-Star, part of the Cavaliers-Warriors rivalry and NBA's most valuable player in 2015, represent at the 2012 Summer Olympics?
Sentence (from "Cavaliers–Warriors rivalry"): While the two teams have played each other since the Cavaliers joined the league in 1970, their rivalry did not develop until the 2014–15 season, when they met in the first of three consecutive NBA Finals series.
Relevant evidence: No