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
What fraction of inhaled mercury vapour is retained in the body? 
Select and explain. 
A. 45 - 50%, B. 55 - 65%, C. 65 - 85%, D. >85%
C: 65 - 85%
Answer: C: 65 - 85% 
Explanation: None