Common cause of retained placenta:: (A) Atonic uterus, (B) Constriction ring, (C) Placenta accreta, (D) Poor voluntary expulsive effort
Answer is A. Ans. is a, i.e. Atonic uterusRef. JB Sharma Obs, Pg 343M/C cause of retained placenta is a simply adherent placenta. This is due to mainly atonic uterus.