This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
Marker for granulosa cell tumor; 
Select and explain. 
A. CA 19-9, B. CA 50, C. Inhibin, D. Teratoma
C: Inhibin
Answer: C: Inhibin 
Explanation: <p> - inhibin B is a peptide growth factor secreted by granulosa cells. - it is a measure of diminished ovarian reserve. - inhibin B is elevated in granulosa cell tumors. Reference : textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no: 135 <\p>