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: Medicine
[{'content': "Chemotherapy is useful in all, except - \nSelect and explain. \nA. Ewing's sarcoma, B. Germ cell tumor, C. Secondaries, D. Carcinoma cervix", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]