CREATE TABLE table_55850 ("Presidency" FLOAT, "President" TEXT, "Date of Birth" TEXT, "Took office" FLOAT, "Left office" TEXT)

What was the greatest Took Office dates that Left Office in 1998?
SELECT MAX("Took office") FROM table_55850 WHERE "Left office" = '1998'
SELECT MAX("Took office") FROM "table_55850" WHERE "Left office" = '1998'