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': 'What dose of radiation therapy is recommended for pain relief in bone metastases? \nSelect and explain. \nA. 8 Gy in one fraction, B. 20 Gy in 5 fractions, C. 30 Gy in 10 fractions, D. Above 70 Gy.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. 8 Gy in one fraction', 'role': 'assistant'}]