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
What dose of radiation therapy is recommended for pain relief in bone metastases – 
Select and explain. 
A. 8 Gy in one fraction, B. 20 Gy in 5 fractions, C. 30 Gy in 10 fractions, D. Above 70 Gy
A: 8 Gy in one fraction
Answer: A: 8 Gy in one fraction 
Explanation: Radiation therapy is used for painful bone metastasis.
The radiation can be given as:-

Single fraction:- 8 Gy in one fraction.
Multifraction regimen:- 20 Gy in 5 fractions or 30 Gy in 6 fractions.

"The greater convenience and lower cost make 8 Gy single fraction the treatment of choice for the majority of patients". _ Bone metastasis: experimental & therapeutic