CREATE TABLE table_14456 ("Week" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Attendance" CLOB)

Who was the opponent when 48,121 people attended?
SELECT "Opponent" FROM table_14456 WHERE "Attendance" = '48,121'
SELECT "Opponent" FROM "table_14456" WHERE "Attendance" = '48,121'