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
The radiation tolerance of whole liver is 
Select and explain. 
A. 15Gy, B. 30Gy, C. 40Gy, D. 45Gy
B: 30Gy
Answer: B: 30Gy 
Explanation: 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.