user: Question: What kind of arch is the Pont de Montanges (Pont-des-Pierres)?
Columns: ['Name', 'Location', 'Land', 'Longest span in s metre ( feet )', 'Arch type', 'Completed']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Pont de la Libération', 'Villeneuve-sur-Lot', 'France', '96 (315)', 'uc', '1919']
SQL:

assistant: SELECT "Arch type" FROM "Table" WHERE "Name" = 'Pont de Montanges (Pont-des-Pierres)';