A dental disease characterised by motting of teeth is due to presence of a certain chemical element in drinking water. Which is that element?

Options

A. Boron
B. Chlorine
C. Fluorine
D. Mercury

Answer

C

Explanation

The excess of fluorine in water causes fluorosis. The symptoms of fluorosis are mottling of teeth (yellowish streaks) and abnormal bones liable to fracture etc. It is an example of endemic disease.