user: Question: What the production code for the episode with 16.10 U.S. viewers?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [1.0, '"Patriarchy"', 'Ken Olin', 'Jon Robin Baitz', 'September24,2006', 101.0, '16.10']
SQL:

assistant: SELECT "Production code" FROM "Table" WHERE "U.S. viewers (millions)" = '16.10';