user: Question: Kaluvanchikudy is the main town in what DS division?
Columns: ['DS Division', 'Main Town', 'Divisional Secretary', 'GN Divisions', 'Area (km 2 )', 'Sri Lankan Tamil', 'Sri Lankan Moors', 'Sinhalese', 'Burgher', 'Other', 'Total', 'Population Density (/km 2 )']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Eravurpattu', 'Chenkalady', 'U. Uthayashreethar', 39.0, 695.0, 60278.0, 12617.0, 2040.0, 119.0, 82.0, 75136.0, 108.0]
SQL:

assistant: SELECT "DS Division" FROM "Table" WHERE "Main Town" = 'Kaluvanchikudy';