All of the Following Are True of Acute Necrotizing Ulcerative

All of the following are true of acute necrotizing ulcerative gingivitis (ANUG) except that it

A) is common in AIDS patients.
B) is associated with severe pain, bleeding, pseudomembranes, and necrosis.
C) involves Treponema vincentii, Prevotella intermedia, and Fusobacterium.
D) is due to poor oral hygiene, altered host defenses, or prior gum disease.
E) is highly contagious.