user: Question: Who wrote episode number 109 in the series?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [92.0, 1.0, '"Nameless, Faceless (Part III)"', 'Charles S. Carroll', 'Chris Mundy', 'September23,2009', '15.85']
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "No. in series" = 109.0;