<prompt> The most common pure germ cell tumour of the ovary :ChoriocarcinomaDysgerminomaEmbryonal cell tumorMalignant Teratoma  <response>: - dysgerminoma is the most common among the malignant germ cell tumors accounting for 40. - affects children and young women. Reference : Textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no: 283 