CREATE TABLE table_45916 ("Date" TEXT, "Round" TEXT, "Opponent" TEXT, "Venue" TEXT, "Result" TEXT, "Attendance" FLOAT)

What is Opponent, when Date is 8 April 1999?
SELECT "Opponent" FROM table_45916 WHERE "Date" = '8 april 1999'
SELECT "Opponent" FROM "table_45916" WHERE "Date" = '8 april 1999'