This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Female Genital Tract, Subject name: Pathology
Schiller- Duval bodies is seen in - 
Select and explain. 
A. Choriocarcinoma, B. Embryonal cell Ca, C. Endodermal sinustumour, D. Immature teratoma
C: Endodermal sinustumour
Answer: C: Endodermal sinustumour 
Explanation: Ans. is 'c' i.e., Endodermal sinus tumor o Yolk sac tumor (endodermal sinus tumor or infantile embryonal carcinoma) - Schiller - Duval bodies,o Leydig (interstitial) cell tumor - Reinke crystalloids.Note : - Rienke crystals are also seen in the hilus cell tumor of ovary.