X-ray film should be kept in a warm, dry place within a sealed package.

Which of the following is the cause of the black residue found in a patient's mouth and nose following smoke inhalation?

A) Tar B) Carbon monoxide C) Carbon D) Cyanide

Cytologic examination can be diagnostic of which of the following diseases?

a. Herpes simplex b. Recurrent aphthae c. Mucous membrane pemphigoid d. Erosive lichen planus e. Frictional hyperkeratosis