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
[{'content': 'Which of the following is the most radiosensitive ovarian tumour? \nSelect and explain. \nA. Endodermal sinus tumour, B. Dermoid cyst, C. Dysgerminoma, D. Serous cyst adenoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Dysgerminoma', 'role': 'assistant'}]