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
Which of the following feature differentiates P.vulgaris from P.Foliaceus? 
Select and explain. 
A. Autoimmune disorder, B. Nikolsky sign positive, C. Fishnet appearance on DIF, D. Buccal mucosa involved
D: Buccal mucosa involved
Answer: D: Buccal mucosa involved 
Explanation: Mucosa is involved only in P.vulgaris not in P.Foliaceous