CREATE TABLE table_31246 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

Who wrote the episode with production code 57376?
SELECT "Written by" FROM table_31246 WHERE "Production code" = '57376'
SELECT "Written by" FROM "table_31246" WHERE "Production code" = '57376'