who is office holder of constituencies <roscommon ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_constituency dbr_Roscommon_ attr_open Dáil_Éireann_constituency attr_close sep_dot var_uri dbp_constituency dbr_Roscommon_ attr_open Dáil_Éireann_constituency attr_close sep_dot var_uri a dbo_OfficeHolder brack_close