This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception, Subject name: Gynaecology & Obstetrics
Serum inhibin B is secreted by ovarian granulosa cells staing at:- 
Select and explain. 
A. Primordial follicle stage, B. Preantral follicle stage, C. Early antral stage, D. Pre ovulatory stage
B: Preantral follicle stage
Answer: B: Preantral follicle stage 
Explanation: Serum inhibin B is secreted by ovarian granulosa cells staing at the preantral follicle stage and therefore reflects the size of the growing follicular coho . Reduced inhibin B levels are seen with aging even in normal feile women . Inhibin B alone has poor predictive value for ovarian response but improves the predictive value when added to the CCCT (chlomiphene citrate challenge test)