All of the Following Statements About Precancerous Changes in the Oral

All of the following statements about precancerous changes in the oral cavity are true EXCEPT:

A) Excessive keratin appears clinically as an ulceration.
B) There may be a lack of keratin production.
C) Abnormal cells can divide at a rapid rate under the influence of a carcinogen.
D) There may be a combination of both excessive keratin and a lack of keratin production.