CREATE TABLE table_72311 ("DS Division" TEXT, "Main Town" TEXT, "Divisional Secretary" TEXT, "GN Divisions" FLOAT, "Area  ( km 2  ) " FLOAT, "Sri Lankan Tamil" FLOAT, "Sri Lankan Moors" FLOAT, "Sinhalese" FLOAT, "Burgher" FLOAT, "Other" FLOAT, "Total" FLOAT, "Population Density  ( /km 2  ) " FLOAT)

Kaluvanchikudy is the main town in what DS division?
SELECT "DS Division" FROM table_72311 WHERE "Main Town" = 'Kaluvanchikudy'
SELECT "DS Division" FROM "table_72311" WHERE "Main Town" = 'Kaluvanchikudy'