CREATE TABLE table_27237 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

What is the production code of the episode that had 5.43 million viewers?
SELECT "Production code" FROM table_27237 WHERE "U.S. viewers (million)" = '5.43'
SELECT "Production code" FROM "table_27237" WHERE "U.S. viewers (million)" = '5.43'