This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy, Subject name: Radiology
[{'content': 'Most radioresistant tumour among following is: \nSelect and explain. \nA. Ewing carcinoma, B. Osteosarcoma, C. Cervical ca, D. Lymphoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: B (Osteo..) Radiosensitivity of fifferent tumours Bhaduri 2nd1. Highly sensitiveLympboma;Seminoma;Mye]oma;Ewing's sarcoma; Wilms tumour2. Moderately sensitiveSmall cell lung cancer: Breast cancer;Basal cell carcinomaiMedulloblastoma; Teratoma; Ovarian cancer3. Relatively resistantSquamous cell carcinoma of lung:Hvpemephroma;Rectal carrinoma;Biadder carcinoma;Soft tissue sarcoma; Carcinoma of cervix4. Highly resistantMelanoma; Osteosarcoma:Pancreatic carcinoma", 'role': 'assistant'}]