Who wrote the episode with production code 2j5568?
CREATE TABLE table_30533 (
    "No." real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
)
SELECT "Written by" FROM table_30533 WHERE "Production code" = '2J5568'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who wrote the episode with production code 2j5568? ### Input: CREATE TABLE table_30533 (
    "No." real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
) ### Response: SELECT "Written by" FROM table_30533 WHERE "Production code" = '2J5568'