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: Dental
Percentage of inorganic component in cementum is: 
Select and explain. 
A. 30%, B. 40-50%, C. 50-55%, D. 20-30%
B: 40-50%
Answer: B: 40-50% 
Explanation: None