<prompt> Which of the following ovarian tumors is most radiosensitive -CarcinoidDysgerminomaSerous CystadenocarcinomaBrenner tumor  <response>: Ans. is b i.e., Dysgerminoma o Dysgerminoma is the most radiosensitive among the ovarian tumors, but radiotherapy is not the treatment of choice as dysgerminoma occurs in pre - reproductive or reproductive age group and fertility is impaired with radiotherapy. 