This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Anatomy
Pseudo rosettes are seen in all except 
Select and explain. 
A. Neuroblastoma, B. Retinoblastoma, C. Medulloblastoma, D. Thecoma
D: Thecoma
Answer: D: Thecoma 
Explanation: Thecomas or theca cell tumors are benign ovarian neoplasms composed only of theca cells. Histogenetically they are classified as sex cord-stromal tumours. They are typically estrogen-producing and they occur in older women (mean age 59; 84% after menopause). Refer Robbins page no 1051