name the office holder whose constituency are <burtola ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_constituency dbr_Burtola_ attr_open Vidhan_Sabha_constituency attr_close sep_dot var_uri dbp_constituency dbr_Burtola_ attr_open Vidhan_Sabha_constituency attr_close sep_dot var_uri a dbo_OfficeHolder brack_close