CREATE TABLE table_4168 ("Series #" FLOAT, "Production Code" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "United States Original Airdate" CLOB, "Canada Original Airdate" CLOB)

Who wrote the episode with a production code of 116?
SELECT "Written by" FROM table_4168 WHERE "Production Code" = '116'
SELECT "Written by" FROM "table_4168" WHERE "Production Code" = '116'