Punched-out, crater-like depressions at the crest of the gingiva, covered by gray pseudo- membranous slough, which is demarcated from the remainder of the gingiva by linear erythema, are characteristic of: (A) Desquamative gingivitis, (B) Erythema multiforme, (C) Lichen planus, (D) Vincent's stomatitis
Answer is D. None