<prompt> Which one of the following not is true regarding choriocarcinoma ?Aggressive malignancyRaised HCG levelsCommon below 20 years of ageGonadal type is chemosensitive  <response>: Ans. is d i.e., Gonadal type is chemosensitiveChoriocarcinoma o Choriocarcinoma may be :-i Placental more common :- Arise in placentaii Gonadal :- Arise in gonads testis or ovaryo Choriocarcinoma occurs in first three decades of life.o Gonadal choriocarcinoma is highly malignant form of gonadal tumor and metastatizes early and widely.o All choriocarcinomas elaborate high level of HCGS which is sometimes helpful in establishing the diagnosis or detecting recurrences.o In contrast to choriocarcinomas arising in placental tissue, those arising in gonads are generally unresponsive to chemotherapy and are often fatal. 