<prompt> Ovulation is associated with sudden rise in -ProlactinTestosteroneLHOxytocin.  <response>: Ans c LHRef: Ganong, 25th edp.403A Surge of Luteinizing Hormone LH Is Necessary for OvulationExactly around 24-36 hrs before ovulation, estrogen increases the levels of LH. This is an example for a positive feedbackThis LH surge brings about ovulation 