Surgical staging is required in which of the following sex cord stromal tumor: (A) Granulosa cell tumor, (B) Gynandroblastoma, (C) Sertoli - leydig cell tumor (well differentiated), (D) Thecoma
Answer is A. Surgical staging is required in

Granulosa cell tumor
Fibrosarcoma 
Sertoli - Leydig cell tumor (intermediate and poorly differentiated)
Sex-cord stromal tumor with annular tubules (independent of peutz-Jeghers syndrome)