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Human Health and Diseases

The substance which causes a definite change in genes is called
A. Toxin
B. Alkaloid
C. Cytotoxin
D. Mutagen

D. Mutagen

A mutagen is a chemical or physical agent capable of inducing changes in DNA called mutations. Examples of mutagens include tobacco products, radioactive substances, x-rays, ultraviolet radiation and a wide variety of chemicals.

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