user: Question: Who wrote the episodes watched by 1.575 million people in Canada?
Columns: ['No.', '#', 'Title', 'Directed by', 'Written by', 'Canadian air date', 'U.S. air date', 'Production code', 'Canadian viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [14.0, 1.0, '" Business as Usual "', 'David Frazee', 'Mark Ellis & Stephanie Morgenstern', 'February27,2009', 'February 27, 2009', 201.0, '1.339']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "Canadian viewers (million)" = '1.575';