Each of the following is most likely to result in frictional keratosis except one. Which one is the exception?

Question

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Frictional keratosis is caused by chronic trauma or friction to a particular area in the oral cavity that leads to the formation of a thickened, white, and keratinized tissue. Chronic cheek biting (A), chewing on an edentulous ridge (B), and tongue chewing (D) are all habits that can cause frictional keratosis. However, cigarette smoking (C) is far less likely to cause frictional keratosis in the oral cavity.

Each of the Following Is Most Likely to Result in Frictional