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': 'Intraoperative Radiotherapy is used in \nSelect and explain. \nA. Pancreatic Carcinoma, B. Gastric Carcinoma, C. Colorectal Carcinoma, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Intra-op radiotherapy\n\nPancreatic, gastric, Colorectal carcinoma.\nHead and neck cancers, Genitourinary cancers.\nRetroperitoneal sarcomas.', 'role': 'assistant'}]