This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Fibroma belongs to ? 
Select and explain. 
A. Germ cell tumor, B. Sex cord stromal tumor, C. Surface epithelial stromal tumors, D. Metastatic tumors from non ovarian primary
B: Sex cord stromal tumor
Answer: B: Sex cord stromal tumor 
Explanation: Ans. is 'b' i.e., Sex cord stromal tumor