Read this: After a lackluster arrival to Oklahoma City for the 2008–09 season, the Oklahoma City Thunder secured a berth (8th) in the 2010 NBA Playoffs the next year after boasting its first 50-win season, winning two games in the first round against the Los Angeles Lakers. In 2012, Oklahoma City made it to the NBA Finals, but lost to the Miami Heat in five games. In 2013 the Thunder reached the Western Conference semifinals without All-Star guard Russell Westbrook, who was injured in their first round series against the Houston Rockets, only to lose to the Memphis Grizzlies. In 2014 Oklahoma City again reached the NBA's Western Conference Finals but eventually lost to the San Antonio Spurs in six games.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): Who did the Thunder lose to in the Western Conference finals?
San Antonio Spurs