CREATE TABLE table_25555 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. viewers  ( million ) " CLOB, "Rank  ( week ) " FLOAT, "Original air date" CLOB)

List the original air date for week 5.
SELECT "Original air date" FROM table_25555 WHERE "Rank (week)" = '5'
SELECT "Original air date" FROM "table_25555" WHERE "Rank (week)" = '5'