<prompt> Which is bilateral tumour:-DysgerminomaImmatureteratomaEndodermal sinus tumurEmbryonal cell carcinoma  <response>: In the choices of this question, all tumors are of Germ Cell origin. Germ Cell tumors are Mostly Unilateral eg, The endodermal sinus tumour is unilateral in 100 of cases However, dysgerminoma can have 10-15 bilaterality teratoma are bilateral in 15 of patients The Epithelial tumors of the ovary are the most common Ovarian tumors and these are bilateral mostly 