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': 'Standard treatment of whole-brain radiotherapy (WB) for brain Metastasis : \nSelect and explain. \nA. 20 grays (Gy) in 10 fractions, B. 30 grays (Gy) in 10 fractions, C. 30 grays (Gy) in 5 fractions, D. 15 grays (Gy) in 10 fractions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B, 30 grays (Gy) in 10 fractionsWhole-brain radiotherapy (WB) to 30 grays (Gy) in 10 fractions - Standard treatment in patients with multiple brain metastases.Current study investigated the potential benefit of dose escalation beyond 30 Gy.', 'role': 'assistant'}]