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 "1951 NBA All-Star Game"): The 1951 NBA All-Star Game was an exhibition basketball game played on March 2, 1951, at Boston Garden in Boston, Massachusetts, home of the Boston Celtics.
Relevant evidence: No