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
Improper handling of mercury in the clinic results in occupational hazard through: 
Select and explain. 
A. Absorption of mercury through skin, B. Mercury along with food, C. Mercury along with filling, D. Mercury along with water
A: Absorption of mercury through skin
Answer: A: Absorption of mercury through skin 
Explanation: None