<prompt> Mc tumour of the ovary -DermoidSerous epithelial tumorMucinousmetastatic  <response>: Ans. is b i.e., Serous epithelial tumorso Most common ovarian tumors is a serous epithelial ovarian tumoro Serous histology accounts for as many as 75 ovarian cancers.CANCER of ovaryClassification of Ovarian CancerOvarian CancerHistogenesisFrequency TypesAge GroupEpithelialCoelomic epithelium85 - 90Serous, mucinous endometrioid, clear cell, Brenner undifferentiatedPeripostmenopausal 45 yearsSex cord stromalGonadal stromal5-7Granulosa cell tumor, Sertoli-Leydig tumorReproductive 20 - 40 yearsGerm cell tumorsPrimitive germ cells6-7Dysgerminoma, endodermal sinus tumor, embryonal, teratoma, chorio CAPrepubertal-pubertal 15-20 yearsOthersMetastatic Krukenberg Types of Epithelial ovarian tumouro Serouso Mucinouso Endometrioido Clear cello Transitional cello Squamous cello Mixed epithelialo Undifferentiatedo Unclassified 