<prompt> Treatment of choice for placental site trophoblastic disease is -ObservationSurgeryChemotherapyRadiotherapy  <response>: Ans. is b i.e., SurgeryPlacental Site Trophoblastic TumorArises from the placental bed trophoblasts and invades the myometrium.Most of these tumors run a benign course, malignancy is rare.Tumor is resistant to chemotherapy.Hysterectomy is the recommended treatment. 