Which season had its last episode air on March 11, 2001?
CREATE TABLE "seasons" (
  "season" real,
  "episodes" real,
  "first_air_date" text,
  "last_air_date" text,
  "timeslot" text,
  "dvd_release" text
);
SELECT "season" FROM "seasons" WHERE "last_air_date"='march 11, 2001';