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 tumour? \nSelect and explain. \nA. Ewing tumour, B. Hodgkin's disease, C. Carcinoma Cervix, D. Malignant fibrous histocytoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ewings sarcoma is highly radiosensitive tumor.', 'role': 'assistant'}]