This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Which of the following is the most radiosensitive ovarian tumour? 
Select and explain. 
A. Endodermal sinus tumour, B. Dermoid cyst, C. Dysgerminoma, D. Serous cyst adenoma
C: Dysgerminoma
Answer: C: Dysgerminoma 
Explanation: Ans. Dysgerminoma