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How much time does take for Mercury to leave the body?

(a) 2 months

(b) 2 years

(c) 18 months

(d) 18 years

This question was posed to me in final exam.

I'm obligated to ask this question of Biological Removal, Biotransformation and Biosorption of Metal Ions from Contaminated Wastewater in portion Bacterial Metabolism in Wastewater Treatment Systems of Environmental Biotechnology

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Correct answer is (d) 18 years

Easiest explanation: Once mercury is administered in the body it comes out of it very slowly and even if exposure is stopped then also mercury sticks around and it takes around 18 years for the body to clear half of the dose of mercury from the body.

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