CREATE TABLE table_11900 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was Geelong's home opponent?
SELECT "Home team" FROM table_11900 WHERE "Away team" = 'geelong'
SELECT "Home team" FROM "table_11900" WHERE "Away team" = 'geelong'