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: Pathology
What percent of giant cell tumor of bone are malignant ? 
Select and explain. 
A. 5 - 10%, B. 15 - 20%, C. 25 - 30%, D. 50 - 60%
A: 5 - 10%
Answer: A: 5 - 10% 
Explanation: None