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': 'Improper handling of mercury in the clinic results in occupational hazard through: \nSelect and explain. \nA. Absorption of mercury through skin, B. Mercury along with food, C. Mercury along with filling, D. Mercury along with water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]