This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Desquamative gingivitis represents oral manifestations of all of the following except: 
Select and explain. 
A. Erosive lichen planus., B. Benign mucous membrane pemphigoid., C. Erythema multiformae., D. Pemphigus.
C: Erythema multiformae.
Answer: C: Erythema multiformae. 
Explanation: Desquamative gingivitis represents oral manifestations of various diseases like

Lichen planus (Erosive or atrophic form),
Cicatrial pemphigoid or Benign mucous membrane pemphigoid
pemphigus.