user: Question: What is the identity of the Brighton Works built train?
Columns: ['Identity', 'Builder', 'Built', 'Wheel Arrangement', 'Notes']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['50 Sutton (originally Whitechapel)', 'Brighton Works', 1876.0, '0-6-0T', 'Under overhaul (2011-08-15)']
SQL:

assistant: SELECT "Identity" FROM "Table" WHERE "Builder" = 'Brighton Works';