Extract the club that Corinthians defeated in the 2012 FIFA Club World Cup.

Context: On 4 July, after reaching the final of the 2012 Copa Libertadores undefeated, Corinthians won its first title after a two-match final against 6-time champions Boca Juniors by drawing 1–1 in Argentina and winning 2-0 at the Estádio do Pacaembu in São Paulo, becoming the ninth Brazilian side to win the Copa Libertadores. The club won the 2012 FIFA Club World Cup after defeating English club Chelsea 1–0 on 16 December 2012.

Answer: Chelsea