<prompt> The most common pure germ cell tumor of the ovary is:ChoriocarcinomaDysgerminomaEmbryonal cell tumorMalignant Teratoma  <response>: Dysgerminoma is the most common malignant germ cell malignancy of the ovary, accounting for about 40 of all ovarian cancers of germ cell origin. Ref: Multimodality Therapy in Gynecologic Oncology By BU. Sevin, 1996, Page 137 