which museum exhibits the the ballet class by edgar degas ?
select distinct var_uri where brack_open dbr_The_Ballet_Class_ attr_open Degas,_Musée_d'Orsay attr_close dbo_museum var_uri sep_dot dbr_The_Ballet_Class_ attr_open Degas,_Musée_d'Orsay attr_close dbo_author dbr_Edgar_Degasbrack_close