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: Dental
In which of the following conditions is the role of microbial plaque most obscure: 
Select and explain. 
A. Periodontitis, B. Juvenile periodontitis, C. Desquamative gingivitis, D. Necrotising ulcerative gingivitis
C: Desquamative gingivitis
Answer: C: Desquamative gingivitis 
Explanation: None