<prompt> Which of the following is the most common cause of persistent trophoblastic disease after H. Mole evacuation?ChoriocarcinomaInvasive molePlacental site trophoblastic tumorResidual Mole  <response>: Ans. D. Residual MoleUpto 20 of women with H. Mole show persistence of tumor in uterus following surgical evacuation.a. 15 persist as persistant or residual mole.b. 5 develop choriocarcinoma.c. Trophoblastic tumors diagnosed for upto 6 months following an abortion or mole is often. An invasive mole, but the one diagnosed after 6 months is usually choriocarcinoma.d. It is to be noted that trophoblastic tumor developing after a full-term pregnancy is always a choriocarcinoma. 