premise: The Galleria Nazionale (on Piazzale Marconi) exhibits more excellent works of Correggio and Parmigianino, and an added prize of the collection, the sketch of a young girl, Testa di Fanciulla, by Leonardo da Vinci.
hypothesis: The National Gallery includes a good selection of pieces by Correggio and Parmigianino as well as the highly coveted work by da Vinci, sketch of a young girl.