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
Standard treatment of whole-brain radiotherapy (WB) for brain Metastasis : 
Select and explain. 
A. 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
B: 30 grays (Gy) in 10 fractions
Answer: B: 30 grays (Gy) in 10 fractions 
Explanation: 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.