Which of the following statements about cancer is false?

Which of the following statements about cancer is false?



(a) Viruses cause some cancers.
(b) Tobacco use is responsible for more than 20% of all cancer deaths.
(c) A mutation in even a single cancer-critical gene is sufficient to convert a normal cell into a cancer cell.
(d) Chemical carcinogens cause cancer by changing the nucleotide sequence of DNA.



Answer: 




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