Which type of patient is especially challenging to communicate with because of impaired mental functions? 

Located in the middle ear, the stapes is also known as the:

A) Stirrup. B) Anvil. C) Hammer. D) Canal.

Opaque white lesions cover right and left buccal mucosae, vestibules, and floor of the mouth of a 15-year-old girl. The lesions do not rub off and are asymptomatic. Biopsy showed intracellular edema and perinuclear condensation of keratin in keratinocytes. There is no inflammatory cell infiltrate of submucosa. This description suggests which of the following?

a. Leukoedema b. Cheek chewing c. Idiopathic leukoplakia d. Lichen planus e. White sponge nevus