user: Question: Name the number of gn divisions for Mannar
Columns: ['DS Division', 'Main Town', 'GN Divisions', 'Area (km 2 )', 'Sri Lankan Tamil', 'Sri Lankan Moors', 'Sinhalese', 'Indian Tamil', 'Other', 'Total', 'Population Density (/km 2 )']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Madhu', 'Madhu', 17.0, 553.0, 6793.0, 559.0, 273.0, 5.0, 1.0, 7631.0, 14.0]
SQL:

assistant: SELECT "GN Divisions" FROM "Table" WHERE "DS Division" = 'Mannar';