user: Question: Who were the authors  of episode having production code 3T7573?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [107.0, 1.0, '"Touch Me I\'m Going to Scream, Part 1"', 'Stuart Gillard', 'Mark Schwahn', 'September1,2008', '3T7551', '3.25']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "Production code" = '3T7573';