What was the production code for the episode with 3.38 million viewers?
CREATE TABLE table_23855 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directedby" text,
    "Writtenby" text,
    "Originalairdate" text,
    "Production code" text,
    "U.S.viewers (million)" text
)
SELECT "Production code" FROM table_23855 WHERE "U.S.viewers (million)" = '3.38'
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 was the production code for the episode with 3.38 million viewers? ### Input: CREATE TABLE table_23855 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directedby" text,
    "Writtenby" text,
    "Originalairdate" text,
    "Production code" text,
    "U.S.viewers (million)" text
) ### Response: SELECT "Production code" FROM table_23855 WHERE "U.S.viewers (million)" = '3.38'