user: Question: What is the GDP $IDB in Istanbul?
Columns: ['Rank', 'City', 'State', 'GDP in $ID B', 'Population M (LUZ)', 'GDP per capita $ID K', 'Eurozone']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [1.0, 'Paris', 'France', '$ 731', 11.5, '$ 62.4', 'Y']
SQL:

assistant: SELECT "GDP in $ID B" FROM "Table" WHERE "City" = 'Istanbul';