<prompt> True about estrogen production in menstrual cycle.Only by theca cellsOnly by granulosa cellsBoth theca and granulosa cellsNone of the above  <response>: Ans b Only by granulosa cellsRef: Ganong, 25th edp.414Estrogen is produced only by granulosa cellsThe theca interna cells supply androstenedione to the granulosa cellsGranulosa cells convert this androstenedione to estradiol with the help of an enzyme aromatase 