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': "Most Radiosensitive tumor - \nSelect and explain. \nA. Brenner's tumor, B. Dysgerminoma, C. Mucinous cystadenoma, D. Teratoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]