Reason
Heavy metals are not harmful to humans.
Assertion
Heavy metals such as cadmium, mercury, nickel are water pollutants.
Heavy metals such as cadmium, mercury, nickel are water pollutants.
A
Both assertion and reason are correct but reason is not the correct explanation for assertion
B
Assertion is correct but reason is incorrect
C
Both assertion and reason are correct and reason is the correct explanation for assertion
D
Both Assertion and reason are incorrect
Correct option is C. Assertion is correct but reason is incorrect
Heavy metals like cadmium, nickel, mercury are dangerous to humans because our body cannot excrete them and, they can change damage kidneys, central nervous system, liver, etc.
Hence option C is correct.