What was the episode number for the episode viewed by 5.68 million viewers?
CREATE TABLE table_30166 (
    "Series episode" real,
    "Season episode" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "U.S. viewers (in million)" text
)
SELECT "Season episode" FROM table_30166 WHERE "U.S. viewers (in million)" = '5.68'
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 episode number for the episode viewed by 5.68 million viewers? ### Input: CREATE TABLE table_30166 (
    "Series episode" real,
    "Season episode" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "U.S. viewers (in million)" text
) ### Response: SELECT "Season episode" FROM table_30166 WHERE "U.S. viewers (in million)" = '5.68'