<prompt> Serum inhibin B is secreted by ovarian granulosa cells staing at:-Primordial follicle stagePreantral follicle stageEarly antral stagePre ovulatory stage  <response>: 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 