Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_30105 ( "Series #" real, "Season #" real, "Title" text, "Written by" text, "Original air date" text, "U.S. viewers (millions)" text )

### Question ###
who were the writers of the episode that had 5.56 millions of north american viewers?

### Accurate SQL ###

SELECT "Written by" FROM table_30105 WHERE "U.S. viewers (millions)" = '5.56'