This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: GIT and hepatobiliary system, Subject name: Radiology
[{'content': 'The radiation tolerance of whole liver is \nSelect and explain. \nA. 15Gy, B. 30Gy, C. 40Gy, D. 45Gy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Liver injury tends to be more common in those patients with radiation doses greater than 30 Gy or when the whole-liver is irradiated. It is usually seen as a result of therapy to adjacent organs, such as pancreatic carcinoma, gallbladder carcinoma, retroperitoneal lymphoma, pleural mesothelioma, distal esophageal and other lower thoracic malignancies.', 'role': 'assistant'}]