CREATE TABLE table_37982 ("Week" FLOAT, "Date" CLOB, "Time" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "NFL Recap" CLOB, "Record" CLOB)

What was the Opponent at Arrowhead Stadium?
SELECT "Opponent" FROM table_37982 WHERE "Game site" = 'arrowhead stadium'
SELECT "Opponent" FROM "table_37982" WHERE "Game site" = 'arrowhead stadium'