<prompt> Most common cause of primary post-paum hemorrhage is:Uterine atonyUterine ineiaUterine inversionRetained placenta  <response>: Ans. a. Uterine atonyPrimary Postpaum Hemorrhage:Atonic uterus: Uterine atony is most common80 casesGrand multiparaOverdistension of the uterus as in multiple pregnancy, hydramnios big babyUterine fibroidPlacenta: Morbidly adherent placentaaccrete, percetaAntepaum haemorrhageboth placenta prae abruptionProlong labour , Mismanaged 3rd stage labour 