Who is the opponent on the game that will be played at metropolitan stadium?
CREATE TABLE "schedule" (
  "week" text,
  "date" text,
  "opponent" text,
  "result" text,
  "kickoff_a" text,
  "game_site" text,
  "attendance" text,
  "record" text
);
SELECT "opponent" FROM "schedule" WHERE "game_site"='metropolitan stadium';