CREATE TABLE table_5808 ("Date" TEXT, "Venue" TEXT, "Opponent" TEXT, "Score" TEXT, "Competition" TEXT)

Which competition had an opponent of Police at the Selayang Stadium?
SELECT "Competition" FROM table_5808 WHERE "Opponent" = 'police' AND "Venue" = 'selayang stadium'
SELECT "Competition" FROM "table_5808" WHERE "Opponent" = 'police' AND "Venue" = 'selayang stadium'