<prompt> Following are the features of inhibin exceptNon-steroidal water-soluble proteinSecreted by Graafian follicleStimulates FSH secretionIncreased secretion of inhibin occurs in polycystic ovarian disease  <response>: Ans. is c, i.e. Stimulates FSH secretionRef: Shaw 15thed, p45; Dutta Gynae 5thed, p72; Leon Speroff 7thed, p197, 8thed, p212,213,172Inhibin: Inhibin is a non-steroidal water soluble protein.Q It is secreted by Graffian follicle.Q It is of two types - Inhibin A and B. In the early and midfollicular phase Inhibin B is the predominant form secreted whereas Inhibin A begins to rise in late filicular phase to reach a peak in mid luteal phase.Inhibin suppresses FSH secretion and not LH In PCOS inhibin secretion increases.Q 