What is the production code of the episode written by Jeff Filgo?
CREATE TABLE table_27988281_1 (
    production_code INTEGER,
    written_by VARCHAR
)
SELECT MAX(production_code) FROM table_27988281_1 WHERE written_by = "Jeff Filgo"
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: What is the production code of the episode written by Jeff Filgo? ### Input: CREATE TABLE table_27988281_1 (
    production_code INTEGER,
    written_by VARCHAR
) ### Response: SELECT MAX(production_code) FROM table_27988281_1 WHERE written_by = "Jeff Filgo"