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
[{'content': 'What fraction of inhaled mercury vapour is retained in the body? \nSelect and explain. \nA. 45 - 50%, B. 55 - 65%, C. 65 - 85%, D. >85%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]